Combine dry ingredients in a saucepan. Add water. Whisk constantly over medium heat until it is thick and bubbly. Remove from heat and add margarine. Stir until margarine is melted. Stir in can of tomatoes.
Return to low heat and cook just long enough for toms to heat. Pour over chips and eat like nachos or use as a dip.
If you would like the dip 'cheesier' use only 1/2 can of tomatoes and peppers.
Serves: about 3
Preparation time: 10 minutes