Fruit Crumble

2 C. fresh fruit (e.g., strawberries, blueberries, cherries, peaches, etc.)
2/3 C. sugar (depending on sweetness of fruit)
1 T. flour
1/2 C. butter
1 C. brown sugar
1 C. flour
1 C. oats
1/4 tsp each baking powder and baking soda and salt

Combine fruit, sugar, and 1 T. flour in a saucepan and bring to a boil. Reduce heat and let simmer, stirring often, until thickened. While the fruit is cooking, prepare the crust: Melt the butter, add the dry ingredients and mix. Pat half into a 9x9 baking pan. Pour the fruit mixture over it. Cover the fruit with the rest of the crust mixture. Bake at 350 for 30 minutes.