Made with a sweet fresh apple filling and a crunchy streusel crumb topping made with crispy oats, brown sugar, and cinnamon.
In a medium bowl, combined oats, flour, brown sugar and cold butter with a pastry cutter, fork or even your hands, until combined.
The crunchy streusel crumb topping should resemble cookie dough when done and easily hold together when pressed.
In a 3 quart baking dish (9×9 or 9×13 will both work — 9×13" will bake a little more quickly), stir together apples, sugar, corn starch and cinnamon until apples are coated.
Crumble oat mixture over fruit in pan and press down slightly. Bake for 40-50 minutes, until oats are golden brown and filling is thick and bubbly at the edges.