Step 1

Preheat the oven to 350F. Grease a 9-inch round cake pan with butter or baking spray.

Step 2

In a medium mixing bowl, whisk together the flour, baking powder, and salt.

Step 3

In a large mixing bowl or the bowl of a stand mixer with the paddle attachment, beat the butter on medium speed until creamy. Add the sugar and beat until light and fluffy, about 3 minutes. Add the eggs one at a time, scraping down the bowl and beating well after each addition. Beat in the sour cream and vanilla.

Step 4

With the mixer on low speed, gradually add the flour mixture just until combined. Fold in three-quarters of the peaches. Spread the batter into the prepared cake pan. Sprinkle the top with the remaining peaches and additional sugar, if desired.

Step 5

Bake for 45 minutes or until a wooden pick inserted into the center comes out clean. Let cool for at least 30 minutes before serving. Cake can be covered and stored at room temperature for up to 3 days.