2 cans bean dip
2/3 c. mayonnaise
1 c. sour cream
1 pkg. taco seasoning mix
2 cans green chilies (optional)
Cheddar cheese
Chopped tomatoes
Chopped scallions

Spread bean dip on bottom of pan. Now layer onions, tomatoes. Then layer (mix together next 3 ingredients: mayonnaise, sour cream, and taco mix). Top with Cheddar cheese. Serve with taco chips.