Preheat the oven to 350 degrees. Line a 9" square baking pan with parchment paper or foil. Spray with cooking spray and set aside.

Combine all ingredients for the streusel. Mix well. The streusel should be crumbly.

In a medium bowl combine the strawberries, rhubarb, brown sugar, and 1/3 cup of flour. Toss to combine.

In a large bowl combine the remaining flour, baking powder, salt, and cinnamon.

In another large bowl beat the butter and powdered sugar until it's light and fluffy. Add in the eggs and vanilla and mix well.

Add the flour mixture to the butter mixture and mix until just combined.

Spread the mixture into the prepared pan. Top with the strawberry rhubarb mix and top with streusel mixture.

Bake for 50-60 minutes or until golden brown and a toothpick inserted into the center comes out clean.

Place on a wire rack to cool. Remove from the pan and cut into bars.