To prepare a strawberry bavarian desserts recipe, first you need to prepare your ingredients. First, you'll need 2 cups of frozen strawberries, 1 cup of sugar, and 2 tablespoons of vanilla extract. Then, mash the strawberries with the vanilla and sugar until they're evenly combined. Next, add the egg yolks and beat the mixture with an electric mixer until it's light and fluffy. Finally, stir in the flour and baking powder. Pour the batter into the prepared pan and bake it at 350? for 30 minutes. Remove the cake from the oven and let it cool for 10 minutes before cutting it into squares.