1 med. onion, chopped
1 tbsp. vegetable oil
2 c. shredded Monterey Jack cheese
1/2 c. shredded Cheddar cheese
1/2 c. half & half
2 tbsp. chopped jalapeno peppers

Place onion and oil in casserole dish. Cover and microwave at high 2-3 minutes or until tender. Stir remaining ingredients. Reduce power to 50 percent. Microwave 3 to 6 minutes until heated and smooth. Stir every two minutes. Serve with taco chips.