Preheat the oven to 400 degrees F
Wash the blueberries and set aside on a paper towel to dry
Wash and dry the peaches
Cut the peaches into bite sized chunks
Line your muffin tins with cupcake liners
Melt the 1/2 cup of butter
Add the flour to a large mixing bowl
Add in the baking powder
Add the brown sugar
Add the white sugar
Add the salt
Stir together
In a separate bowl whisk the eggs
Add the milk
Add the melted butter slowly so it does not cook the egg
Fold in the peaches and the blueberries
Use an ice cream scoop to measure and add the mixture into the muffin tin, only fill to liners to the top. Try to equally fill each muffin cup for consistency.
Cook for 23-25 minutes check for doneness with a toothpick inserted, If it is removed clean your muffins are cooked.
Place the tin of muffins on a cooling rack for a few minutes before removing the muffins.
Let the muffins cool on the rack before adding the topping