Preheat the oven to 350° Fahrenheit. Cover a 15x10 inch baking sheet with parchment paper.
Making The Batter
Cream butter and sugar with an electric mixer. Add eggs and vanilla extract and continue to beat on medium speed until the batter is smooth and creamy.
Add flour, baking powder, and salt and beat until all of the ingredients have been well combined. The batter should be thick and creamy.
Pour the batter onto the baking sheet and spread it evenly.
Spread your favorite preserve on top of the batter.
Making The Streusel Topping
Combine flour, sugar, and melted butter. Use your hand mixer and combine until the dough turns into crumbs. Layer the sweet crumb topping over the preserve spread and top with sliced almonds.
Bake for 25 minutes at 350° Fahrenheit. Use a toothpick to check the doneness.