Apple Raspberry Crumb Cake

Ingredients

• For the crumb topping:
• 6 tbsp unsalted butter, melted
• 1 1/2 cups all-purpose flour
• 1/2 cup granulated sugar
• 1/4 tsp kosher salt
• Zest of half a lemon
• For the cake:
• 3/4 tsp baking powder
• 1/2 tsp baking soda
• 6 tbsp unsalted butter, softened
• 2 large eggs
• 2/3 cup sour cream
• 1 tsp vanilla extract
• Juice of half a lemon
• 1 large (or 2 small) Pink Lady or Fuji apple, peeled, cored, and chopped into about 1/4-inch dice
• 1/4 cup fresh raspberries
• For the glaze:
• 1 cup powdered sugar, divided