A cozy strawberry rhubarb crisp with a buttery oat and brown sugar topping. Bright, slightly tart fruit pairs with a crunchy crumble for a comforting dessert.
Preheat oven to 375°F (190°C). Butter an 8x8-inch baking dish and prep fruit.
In a large bowl, toss strawberries and rhubarb with sugar, cornstarch, lemon juice, vanilla, and salt. Let sit 10 minutes.
Combine oats, flour, brown sugar, cinnamon, salt, and nuts. Cut in cold butter with a pastry blender or fingers until mixture is crumbly with pea-sized bits.
Spread the fruit in the baking dish and sprinkle topping evenly. Bake 35–45 minutes until bubbling and golden. Tent with foil if topping browns too quickly.
Allow the crisp to cool at least 15 minutes before serving so the filling sets. Serve warm with ice cream or whipped cream.
Notes
For frozen fruit, bake 10–15 minutes longer without thawing first.
Adjust sugar to balance tartness of rhubarb; taste a piece of raw mixture if unsure.
To make topping extra crunchy, add nuts or chill topping for 10 minutes before baking.
Reheat leftovers in a 350°F oven for 10–12 minutes to refresh the topping.