Preheat the oven to 325 degrees F, line an 8-inch diameter cake pan with parchment, and mist the sides of the pan with non-stick spray.
Place the flour, sugar, baking powder, baking soda, and salt in a large mixing bowl and stir to combine.
Stir in the softened butter until the mixture resembles coarse crumbs.
Stir in the eggs (one at a time), allowing each one to become fully incorporated before adding the next.
Stir in the sour cream, vanilla, lemon zest, and lemon juice until smooth.
Mix on medium speed for about 90 seconds to aerate the batter and build the cake's structure.
Place half the batter in the prepared pan, then layer on the apples and raspberries.
Spoon the remaining batter over the fruit, then top with the crumb mixture.
Bake until a toothpick inserted in the center of the cake comes out clean or with a few moist crumbs (approx. 30 to 40 minutes).
Cool completely, then drizzle with glaze.