Step 1: Preparing the Croissant Dough (Skip if using store-bought croissants)

1. In a bowl, mix flour, sugar, salt, and yeast.
2. Cut cold butter into small cubes and mix it into the flour.
3. Add warm milk and egg, then mix until a dough forms.
4. Roll out the dough into a large rectangle, then fold it into thirds.
5. Chill the dough in the refrigerator for 30 minutes. Repeat this rolling and folding process three times.

Step 2: Shaping the Croissants

1. Roll out the dough into a thin rectangle (about ¼ inch thick).
2. Cut it into triangles with a 5-inch base.
3. Roll each triangle from the base to the tip to form a croissant shape.
4. Place on a baking sheet and let rise for 1 hour.

Step 3: Baking the Croissants

1. Preheat oven to 375°F (190°C).
2. Brush croissants with egg yolk for a golden crust.
3. Bake for 18–20 minutes until golden brown and flaky.
4. Let cool for 10 minutes before filling.

Step 4: Adding the Strawberry Filling

1. Slice croissants horizontally, but don’t cut all the way through.
2. Spread a thin layer of strawberry jam inside (optional).
3. Add fresh strawberry slices and a spoonful of whipped cream or pastry cream.
4. Sprinkle with powdered sugar for a bakery-style finish.