Step 1

Preheat the oven to 350F. Butter an 8x8-inch baking dish (or a 2-quart baking dish).

Step 2

In a large mixing bowl, stir together the sliced peaches, lemon juice, and vanilla. Add the sugar, cornstarch, and cinnamon and stir until the fruit is evenly coated. Pour into the greased baking dish.

Step 3

In a medium mixing bowl, whisk together the flour, oats, brown sugar, cinnamon, salt, and nutmeg. Mix in the butter with a fork or your fingers until the mixture is sticky but still lumpy and crumbles. Sprinkle over the top of the peaches.

Step 4

Bake for 50 minutes or until the topping is browned and the filling is very bubbly. Let cool for 15 minutes before serving with vanilla ice cream.