Chili Con Queso
["1 onion, chopped", "2 Tbsp. oil", "1 (4 oz.) can green chilies, chopped", "1/2 tsp. salt", "1 (8 oz.) can tomato sauce", "1 1/2 c. each: shredded Cheddar and Monterey Jack cheeses"]
["Saute onion in oil.", "Add remaining ingredients.", "Heat over medium heat, stirring constantly until cheese melts.", "Serve with tortilla chips."]
["onion", "oil", "green chilies", "salt", "tomato sauce", "cheeses"]