Lemon Rhubarb Apple Dessert in 1 Hour

Instructions:

1. Preheat your oven to 375°F (190°C).
2. In a large bowl, toss the sliced apples and rhubarb with lemon juice, zest, sugar, cornstarch, cinnamon, and salt until evenly coated.
3. Pour the fruit mixture into a 9x9 inch baking dish, spreading it evenly.
4. In a separate bowl, whisk together the flour, oats, brown sugar, cinnamon, and salt.
5. Add the cold, cubed butter and use a pastry cutter or fingertips to rub the butter into the dry ingredients until the mixture resembles coarse sand with pea-sized clumps.
6. Sprinkle the crumble topping evenly over the fruit without pressing it down.
7. Bake for 40–45 minutes until the fruit juices are bubbling around the edges and the topping is a deep mahogany-colored gold.