Step 1: Preheat the Oven

Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan or line it with parchment paper.

Step 2: Prepare the Dry Ingredients

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

Step 3: Cream Butter and Sugar

In a large mixing bowl, use a hand or stand mixer to cream the softened butter and sugar until light and fluffy, about 2–3 minutes.

Step 4: Add Wet Ingredients

Beat in the eggs, one at a time, followed by the vanilla extract. Mix in the sour cream or Greek yogurt until fully combined.

Step 5: Combine Wet and Dry Ingredients

Gradually add the dry ingredients to the wet ingredients, mixing just until incorporated. Do not overmix.

Step 6: Assemble the Cake

Spread the batter evenly into the prepared pan. Arrange the peach slices in a circular pattern on top of the batter. Sprinkle the sugar-cinnamon mixture evenly over the peaches.

Step 7: Bake

Bake in the preheated oven for 35–40 minutes, or until a toothpick inserted into the center of the cake comes out clean.

Step 8: Cool and Serve

Allow the cake to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely. Serve warm or at room temperature.