Preheat your oven to 350°F (175°C).

Grease and flour a 10-inch bundt pan or two loaf pans.

In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy, about 5 minutes.

Add the eggs one at a time, beating well after each addition.

In another bowl, whisk together the all-purpose flour, baking powder, and salt.

Gradually add the dry ingredients to the creamed mixture, alternating with the milk, starting and ending with the flour mixture until just combined.

Fold in the diced peaches, vanilla extract, and cinnamon carefully.

In a small bowl, mix the brown sugar with a sprinkle of cinnamon for the topping.

Pour the batter into the prepared pan and sprinkle the topping mixture over the cake.

Bake in the preheated oven for approximately 50-60 minutes or until a toothpick inserted into the center comes out clean.

Allow the cake to cool in the pan for about 15 minutes, then transfer it to a wire rack to cool completely.

Slice and serve with your favorite toppings such as vanilla ice cream or honey.