To prepare a strawberry crumble bars recipe, you will first need to prepare the ingredients for the recipe. You will need: 1 cup granulated sugar, 2 tablespoons butter, 1 tablespoon vanilla extract, and 1 teaspoon cinnamon. Preheat the oven to 350 degrees F (180 degrees C). Grease and flour two 9-inch square pans and set aside. In another bowl, combine the flour, baking powder, sugar and salt. Gradually add the wet ingredients to the dry ingredients, mixing well after each addition. Pour the batter into the prepared pan and bake in the preheated oven for 20 to 25 minutes or until the top is golden brown. Let the bars cool before removing them from the pan.