Step 1

Preheat oven to 350°F (177°C). Lightly grease a 9×13-inch baking pan. Any 3.5-4-quart baking dish works.

Step 2

Mix all of the filling ingredients together in a large bowl, then spread into the baking pan.

Step 3

Whisk the flour, brown sugar, and cinnamon together in a medium bowl. Cut in the butter using a pastry cutter or fork until the mixture becomes super crumbly. Stir in the oats. Sprinkle over filling.

Step 4

Bake for 45 minutes or until the topping is golden brown and the fruit juices are bubbling around the edges. Remove from the oven, place on a wire rack, and allow to cool for at least 5 minutes before serving. Serve warm, room temperature, or cold; plain or with salted caramel and/or vanilla ice cream.

Step 5

Cover leftovers and store in the refrigerator for up to 5 days.