Terri's Fruit Crisp

Filling:
2 c blueberries
4 c apples (peeled and sliced)
2 c fresh or frozen cranberries
3/4 c sugar
1/4 flour
grated rind of 1 lemon


Topping:
1 1/2 c quick rolled oats
3/4 c brown sugar
1/4 c whole wheat flower
2+ tsp cinnamon
1/4 c butter or margarine (melted)
1/4 c walnuts or pecans (optional)

Butter 9"x13" pan
Bake @ 375 for 40-45 min.