Good-Cooking - Fresh Peach Cake

Ingredients

• 1/2 cup butter
• 1 1/2 cups firmly packed brown sugar
• 1 egg
• 2 cups all-purpose flour
• 1 teaspoon baking soda
• Dash of salt
• 1 cup buttermilk
• 4 peaches, peeled and diced
• 1/4 cup granulated sugar
• 1 teaspoon cinnamon