Mustikkapiirakka is one of Finland’s summer classics, the kind you meet on the coffee table from Karelia to Lapland: a crisp shortcrust base, a thick layer of whole blueberries and a creamy top of soured milk, egg and sugar, baked until it has only just set. In Finland the filling is made with kermaviili, but outside Finland Greek yoghurt does the job just as well — the same fresh tang that keeps the blueberry sweetness in balance.
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The air fryer is a surprisingly good place to bake it. The basket is small, the heat circulates evenly around the pan, and the base turns crisp all the way to the middle instead of soaking up berry juice. The whole tart is ready in 65 minutes: 20 minutes of prep, 25 minutes at 170 °C, and the 20 minutes of cooling time the filling needs to set completely.
Estimated reading time: 4 minutes
Table of Contents:
Why I love blueberry cream tart in the air fryer
What makes this tart special is the three layers baking at once, each doing something different: a buttery shortcrust, berries simmering in their own juice, and a filling that should end up creamy rather than set firm. In an oven it’s an exercise in patience, because the heat first has to spread through a large space. The air fryer has no waiting time — the basket is small, and the 170 °C hits the pan from every side at once.
At the same time, I avoid heating up the whole kitchen in the middle of blueberry season. An air fryer uses noticeably less power than an oven for a single tart, and that’s exactly why mustikkapiirakka has become a fixed part of my summer routine, while the oven otherwise sits untouched for weeks.
The difference between air fryer and oven with a creamy filling
The fast airflow is the tart’s friend at the base and its biggest risk at the surface. The filling sets from the top down, so the top can pick up colour long before the middle is done. That’s why I stick to 170 °C instead of turning up the heat: a lower, stable temperature gives the filling time to thicken without the eggs splitting and turning grainy. If the top still gets too much colour toward the end, I lay a loose piece of foil over the pan. And the pan needs to fit in the basket with a couple of centimetres of air all the way round, so the heat can reach down along the sides.
My kitchen test of blueberry cream tart
I baked the tart in my Cosori Dual Blaze at 170 °C, and 25 minutes is the point where it needs to come out. When I pulled the pan out, the filling had set all the way to the pastry edge, while the innermost centimetres still wobbled slightly when I tilted the pan — exactly as it should be. The 20 minutes of cooling time on the kitchen counter does the rest: the filling sets completely, the berry juice thickens, and the base keeps its crunch because it isn’t cut while warm.
With 20 minutes of prep, I end up at 65 minutes from fridge to coffee table. If you have a Philips XXL, you can use a slightly larger pan and get more slices out of the same baking time — as long as the filling layer stays the same thickness. It’s the height of the filling, not the tart’s diameter, that determines when it’s done.
Take the tart out while the middle is still wobbling slightly. The 20 minutes of cooling time are part of the baking, not a break afterwards.
Tips and tricks from the author: Morten Jensen
The typical mistakes and how to avoid them
The mistake I see most often is the urge to turn up the heat to save time. Above 170 °C the eggs in the filling split, and you end up with a grainy surface over a base that’s had too much heat — hold the temperature, and let the tart have the 25 minutes it needs. The next one is overbaking: if you wait until the middle is completely set in the air fryer, the tart turns dry once it’s cold, and the filling cracks across the top. Take it out while the middle is still soft and wobbly. The third mistake is about the berries. If you use frozen blueberries, put them in straight from frozen and toss them in a little flour first; if you thaw them, they release so much juice that the shortcrust turns soggy instead of crisp.
How to serve blueberry cream tart
The tart can stand entirely on its own, but a few classic companions lift it further:
- Warm with a scoop of vanilla ice cream melting into the berry layer
- Cold with lightly whipped cream and a light dusting of icing sugar
- Cut into small squares for the coffee table, the way the Finns do it
- With a glass of cold buttermilk or thick soured milk for the tangy contrast
- Topped with fresh blueberries and a little finely grated lemon zest
Storage and reheating
The filling is dairy-based, so the tart belongs in the fridge, not under a tea towel on the counter. Covered, it keeps well for three days, and the flavour rounds out the next day, once the berry juice has soaked down into the base. If you want it warm again, put the slices back in the air fryer on low heat for a few minutes — just enough for the base to turn crisp again, without the filling getting hot enough to split. I can’t recommend freezing: the filling turns grainy on thawing, and the shortcrust loses its crunch.
Mustikkapiirakka rewards restraint — low heat, a short baking time, and a cooling time you don’t skip. Follow those three things and you’ll get a tart with a crisp base, whole berries, and a creamy top that tastes of Finnish summer.
FAQ
Yes. Add them straight from frozen without thawing, and toss them first in a tablespoon of flour or potato starch so the juice gets bound. Thawed berries release so much liquid that the shortcrust base turns soggy.
Greek yoghurt is the closest substitute outside Finland and gives the same fresh tang. 18% crème fraîche or cultured buttermilk also works. Avoid thin natural yoghurt — the filling will never set properly.
After 25 minutes at 170 °C, the filling should have set at the edge and still wobble slightly in the middle. It finishes setting during the 20 minutes of cooling time. If the middle is already completely firm in the air fryer, the tart will turn out dry.
Recipe
Blueberry cream tart in the Air Fryer
Cooking Guide
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Airfryer size
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Recommended equipment
- 1 Air fryer
- 1 Springform pan - 18 cm, needs to stand freely in the basket
- 1 Mixing bowl
- 1 Whisk
- 1 Parchment paper - For lining the pan
Shopping list
Ingredients
Shortcrust base
Blueberries and cream filling
- 250 g blueberries (Fresh or frozen, not thawed)
- 200 g Greek yoghurt (Substitute for Finnish kermaviili)
- 1 pcs egg
- 50 g sugar
- 1 tsp vanilla sugar
- 1 tbsp plain flour (To bind the filling)
How to make it
Preparation
- Cream 100 g butter and 75 g sugar together until pale and fluffy in a mixing bowl, then whisk in 1 pcs egg.
- Line an 18 cm springform pan with parchment paper. Press the dough into the base and about 2 cm up the sides, so it forms an even layer.
- Whisk 200 g Greek yoghurt, 1 pcs egg, 50 g sugar, 1 tsp vanilla sugar and 1 tbsp plain flour together into a smooth, lump-free cream.
- Place 250 g blueberries in an even layer on the pastry base, and carefully pour the cream over so the berries are covered.
Cooking in the air fryer
- Preheat the air fryer to 170 °C fan.
- Place the pan in the basket and bake the tart for 25 minutes at 170 °C. Loosely cover with a sheet of parchment paper for the last 5-8 minutes if the surface is browning too much.
- Check the tart: the filling should be set at the edge and still slightly soft in the middle, and the pastry edge should be golden brown. Bake for another 3-5 minutes if the filling is still runny.
Serving
- Leave the tart to cool for 20 minutes in the pan, so the cream filling fully sets, before slicing it.
- Serve the tart warm or cold with a dusting of icing sugar, a scoop of vanilla ice cream or lightly whipped cream.
Our notes for the recipe
The filling should still be a touch soft in the middle when the tart comes out of the basket — it will finish setting as it cools. If baked completely firm, the cream turns dry and grainy. Variation:
Use kermaviili if you can get hold of the original Finnish product. Cultured buttermilk or 18% crème fraîche also work well instead of the Greek yoghurt. The blueberries can be swapped for blackberries or raspberries. Serving:
Serve the tart warm with icing sugar, vanilla ice cream or lightly whipped cream, and a cup of black coffee. Portion size:
The pan needs to stand freely in the basket so the air can circulate all the way round. If your air fryer is small, use a 16 cm pan and extend the baking time by 3-5 minutes.
Your notes for the recipe
Nutrition per serving (Guideline)
Important about shelf life and nutrition
Nutrition per serving (guideline): Calculations are based on data from the United States Department of Agriculture (USDA). Shelf life (guideline): Shelf life data is provided, as far as possible, by public institutions, including national food authorities. Our information is therefore only indicative, and it is your responsibility to obtain and calculate accurate information about shelf life and nutrition for all recipes on airfryerkogebogen.dk
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