In an 8x8 baking dish, toss rhubarb with strawberries, brown sugar, corn starch, lemon juice, cinnamon, vanilla extract and salt.
In a small bowl, stir flour with oats, sugar and salt until combined. Add butter. Work butter into flour mixture, using your fingertips, until crumbly. Sprinkle mixture evenly over top of fruit.
Bake for 30-35 minutes or until bubbly and topping has browned.
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