Strawberry-Rhubarb Puff
["1 (16 oz.) pkg. frozen rhubarb", "1 (10 oz.) pkg. thawed strawberries", "1/2 c. sugar", "2 c. flour", "2 Tbsp. sugar", "3 tsp. baking powder", "1 tsp. salt", "1/2 c. salad oil", "2/3 c. milk", "butter", "2 Tbsp. sugar", "1 tsp. cinnamon"]
["Use a 9 x 9 x 2-inch pan."]
["frozen rhubarb", "thawed strawberries", "sugar", "flour", "sugar", "baking powder", "salt", "salad oil", "milk", "butter", "sugar", "cinnamon"]