1 c. brown sugar
3 tbsp. flour
Pinch of salt

Mix with fingers, crumble into crust. (Pat in pan crust) Pour 1 large can evaporated milk over sugar mixture. Don't mix. Dot with 2 1/2 tablespoons butter. Sprinkle cinnamon on top. Bake at 350 degrees for 1 hour. Should bubble up in center - if not, let cook a little longer.