01 - Preheat oven to 375°F. In a large bowl, toss sliced peaches with lemon juice until evenly coated.
02 - In a separate bowl, mix rolled oats, almond flour, brown sugar, and cinnamon. Stir in melted butter until combined and topping forms coarse crumbs.
03 - Arrange peaches in an even layer in a baking dish. Sprinkle oat and almond topping evenly over the fruit.
04 - Bake for 35 to 40 minutes, until the topping is golden brown and filling is bubbling around the edges.