Turn your oven up to 375. Lightly butter the bottom of your baking dish. Spread the corn in an even layer over the bottom, and then a layer of blueberries or peaches (reserve a handful for the top.)
In a bowl, mix together your dry ingredients: oats, baking powder, cinnamon, rosemary and salt. In another bowl, whisk together your milk, egg, vanilla and honey.
Pour the oats on top of the corn and blueberries, and then the milk/egg mixture on top of that. Dot with the pieces of butter, all over the top. Then drop on your extra berries and pop into the oven for about 30-35 min, or until bubbling but golden on top. Serve with a dollop of yogurt and some strong coffee.