Preheat oven to 350 degrees.
Grease the bottom and sides of a 9-inch springform pan then line with parchment paper and set aside
Combine flour, baking powder, baking soda and salt in a medium-sized mixing bowl. Whisk to combine then set aside.
Cream butter and sugar with an electric mixer until light and fluffy (approximately 4 to 5 minutes), scraping down the sides of the bowl with a spatula as needed.
Add eggs, one at a time, beating after each addition until incorporated.
Beat in vanilla.
Reduce mixer speed to low then add 1/2 cup of flour mixture. Beat until combined.
Add sour cream and continue beating on low until incorporated.
Add remaining flour, beating on low until just combined. Avoid overmixing or cake will be dry.
Spoon cake batter into springform pan then smooth top with a spatula.
Top batter with diced strawberries.
Remove crumble topping from the refrigerator and sprinkle atop strawberries.
Bake for 40 to 45 minutes or until a toothpick inserted into the center of the cake comes out clean. Avoid overbaking.
Place pan on a wire baking rack and allow cake to cool completely before removing the springform ring.
If desired, dust cake with powdered sugar before slicing and serving.
Cake is best the day it is made but it can be loosely covered and stored at room temperature for 2 days or refrigerated up to 3 days.