These almond croissants are incredibly easy to make and are made with day-old croissants filled with almond pastry cream (frangipane) and sliced almonds.
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
Make the simple syrup: In a small saucepan, combine the water and sugar. Heat until the sugar dissolves, then let it cool.
Make the almond filling (frangipane): into a large mixing bowl, add the room temperature butter, salt, and sugar, and mix with an electric hand mixer until creamy and smooth.
Add the eggs and mix until well combined.
Add the almond flour and flour and mix until the mixture is smooth and homogeneous. Transfer the almond cream to a piping bag and cut a small but not too small slit in the tip.
Slice day-old croissants in half horizontally, like a sandwich. Lightly brush the inside of each half with the cooled simple syrup.
Spread or pipe a layer of almond cream on the bottom half of each croissant, then place the top half back on.
Spread a little more filling on top of each croissant. Sprinkle sliced almonds over the top and make sure they stick to the almond cream.
Place the croissants on the prepared baking sheet and bake in a 350°F (180°C) preheated oven for about 15–20 minutes, or until lightly golden brown and the frangipane sets.
Let cool slightly, then dust with powdered sugar before serving.
Notes
Use day-old croissants. Slightly stale croissants absorb the syrup and almond filling better than fresh ones.
Don’t skip the syrup. Brushing the inside of each croissant with simple syrup keeps them moist and brings them back to life.
Use full-fat butter. For a richer, creamier almond filling (frangipane), always go with real, unsalted butter.
Almond flour is key. Use finely ground almond flour (not almond meal) for a smooth filling with the best texture.
Chill the filling if too soft. If your frangipane feels too runny, pop it in the fridge for 10–15 minutes to firm up before spreading.
Don’t overfill. A generous layer inside is great, but too much can cause the filling to leak out during baking.
Use a pastry bag for neatness. For cleaner, more even filling, pipe the frangipane instead of spooning it in.
Watch the almonds on top. Keep an eye during baking, sliced almonds can brown quickly.
Serve warm for best taste. Reheat slightly before serving for that fresh-from-the-bakery flavor and texture.