Lemon Raspberry-Filled Cupcakes with White Chocolate Buttercream Frosting

Name: Lemon Raspberry-Filled Cupcakes with White Chocolate Buttercream Frosting
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 3 cups sifted all-purpose flour; 1 tsp baking powder; 1 tsp baking soda; 1/2 tsp salt; 1 cup (2 sticks) unsalted butter, room temperature; 2 cups sugar; 4 eggs; 1 1/4 cups buttermilk; 1 1/2 tsp vanilla extract; 2 Tbsp fresh lemon juice; Zest of 1 large lemon; 2 pints raspberries; ½ cup granulated sugar; 1 1/2 tsp cornstarch; 1 cup butter, softened; 4 cups confectioner’s sugar; 1/4 tsp salt; 1 tsp vanilla; 10 oz white chocolate, melted and slightly cooled; 2 Tbsp milk + more if needed