Preheat the oven to 350F.
Remove pits from peaches and thinly slice the fruit.
Prepare the filling by mixing all ingredients in a 9x9 inch baking dish.
Prepare the topping by mixing all the dry ingredients–everything except the coconut oil. Melt the coconut oil and stir it in until the oat mixture is moist throughout. If it feels too dry, add an extra tbsp of melted coconut oil.
Spoon the topping onto the filling and spread evenly. Bake for 30 minutes, until the top becomes a light golden-brown and the filling bubbles up around the edges.
Let cool for 10-15 minutes before serving.
