Making the Peach Cake with Brown Sugar Frosting is straightforward. Follow these step-by-step instructions for a seamless baking experience:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.

2. Prepare Peaches: Dice the fresh peaches and sprinkle with lemon juice to prevent browning. Set aside.

3. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.

4. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar together until light and fluffy, about 3-4 minutes.

5. Add Eggs: Add the eggs one at a time, mixing well after each addition. Then, stir in the vanilla extract.

6. Combine Mixtures: Gradually add the dry ingredients to the butter mixture, alternating with the buttermilk. Start and end with the flour mixture, mixing until just combined.

7. Fold in Peaches: Carefully fold in the diced peaches, ensuring they are evenly distributed.

8. Divide Batter: Pour the batter evenly into the prepared cake pans. Smooth the tops with a spatula.

9. Bake the Cakes: Place the pans in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.

10. Cool the Cakes: Once baked, remove the pans from the oven and allow the cakes to cool in the pans for about 20 minutes. Then, transfer them to a wire rack to cool completely.

11. Make the Frosting: In a large bowl, beat the softened butter until creamy. Gradually beat in the brown sugar, mixing until smooth. Alternate adding the powdered sugar and milk, beating until desired consistency is reached. Add vanilla extract and a pinch of salt.

12. Frost the Cake: Once the cakes are completely cooled, place one layer on a serving platter. Spread a generous amount of frosting on top. Place the second layer on top and cover the entire cake with the remaining frosting.

These straightforward instructions will reward you with a beautiful and delicious Peach Cake!