Preheat oven to 350. To a bowl add the oats, salt, baking powder, and sugar. Stir the dry ingredients then add the eggs, butter, milk, and vanilla. Whisk the mixture until the eggs are fully beaten in.
Add the blueberries and fold them in. Pour the mixture into a baking dish and top it with the peaches. Bake in for 35-40 minutes or until the center is set.
I recommend using a 9x13 baking dish. Smaller baking dishes will take longer to cook.