Strawberry Rhubarb Buckle

Step 1
Combine rhubarb, strawberries, 1/2 cup sugar, lemon juice, and 1 tablespoon of water in a saucepan. Cook, covered, over medium-low heat, stirring occasionally until mixture begins to boil, about 5 minutes. Reduce heat to low.

Step 2
In a small bowl, stir together remaining 2 tablespoons of water with cornstarch until cornstarch is dissolved. Add mixture to the saucepan and continue cooking fruit until mixture begins to thicken, about 2 minutes. Remove from stove and set aside to cool.

Step 3
Preheat the oven to 350 degrees F (175 degrees C). Spray a 9-inch deep dish pie pan with non-stick cooking spray, and place on a baking sheet.

Step 4
Beat 1/2 cup of butter and 1/2 cup of sugar with an electric mixer in a bowl until light and fluffy. Beat in egg, vanilla extract, and yogurt. Add flour, baking powder, baking soda, and salt; mix until just combined. Spread 2/3 of the batter into the prepared pan. Pour strawberry-rhubarb filling on top of the batter. Spread remaining 1/3 of the batter in small mounds atop the filling. Set aside.

Step 5
Combine brown sugar, 1/4 cup flour, and 2 tablespoons of butter in a small bowl. Mix using a fork, a pastry blender, or your hands, until the mixture resembles coarse crumbs. Sprinkle on top of the batter and filling.

Step 6
Bake in the preheated oven until the cake topping is nicely browned, about 35 minutes.