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-Preheat your oven to 350°F. Grease and flour a 9-inch round baking pan to prevent sticking.
-Mix dry ingredients: In a medium bowl, sift together 1-1/2 cups flour, baking soda, baking powder, and salt.
-Cream butter and sugar: In a large bowl, use an electric mixer to beat the sugar and softened butter until light and fluffy.
-Add wet ingredients: Beat in vanilla and eggs, one at a time, ensuring each is well incorporated before adding the next.
-Combine with dry ingredients: Alternately fold in the flour mixture and sour cream to the butter mixture, starting and ending with the flour. This method helps keep the batter airy.
-Prepare the base: Spread the batter evenly into the prepared pan. Top with peach slices arranged in a single layer.
-Make the crumb topping: In another bowl, mix together brown sugar, 1 cup flour, cinnamon, and salt. Pour in melted butter and stir until the mixture is uniformly moist. Crumble this mixture over the peaches.
-Bake: Place in the oven and bake for 45-55 minutes, or until a cake tester or toothpick inserted into the center comes out clean.
-Cool and serve: Allow the cake to cool before serving to let the flavors meld together beautifully.