Place margarine in a deep ovenproof bowl or casserole and place in a 450 degree oven to melt while assembling the other ingredients. Mix together the flour, sugar, milk and vanilla. Stir until smooth. Remove the bowl from the oven and pour flour mixture over melted margarine. Don't stir. Pour can of peaches over the top of this. Again, don't stir. Return to the oven and cook at 450 degrees for 10 mins. Turn oven to 375 degrees and cook until crust to the top and is golden brown.
