Preheat oven to 400°. Sauté ½ cup chopped onion in 1 tbsp. vegetable oil in a frying pan until softened. Add 1 lb. ground bison* or beef and cook, stirring to break up meat, until no longer pink, 4 minutes. Season with ½ tsp. black pepper.
Spread 4 oz. corn tortilla chips in a shallow baking dish and top with half of meat, 1/3 cup fresh salsa verde, and ¾ cup shredded jack cheese. Repeat layers. Bake until cheese melts and chips start to brown, 6 minutes. Serve with shredded lettuce, sliced avocado, diced tomatoes, sour cream, and salsa.
*Buy at well-stocked grocery stores.
Recipe: Bison Nachos