Apple Rhubarb Crisp

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Butter a 9×13-inch baking dish.

Step 2
Mix apples, rhubarb, 1 cup white sugar, 1/4 cup flour, and 1 teaspoon cinnamon in a bowl until thoroughly combined. Spread fruit mixture into the bottom of the prepared baking dish.

Step 3
Mix oats, remaining 1 1/2 cups flour, and brown sugar in a separate bowl; cut in butter until crumbly. Spread evenly over fruit mixture.

Step 4
Mix 2 tablespoons white sugar with remaining 1/2 teaspoon cinnamon in a small bowl; sprinkle over oat topping.

Step 5
Bake in the preheated oven until fruit is bubbling and thick and topping is golden brown, about 45 minutes. Let cool 10 to 15 minutes, then serve.