Preheat your oven to 400°F (200°C) to ensure crispy nachos.
In a large skillet, heat 1 teaspoon of olive oil over medium heat. Add diced sweet onion, red and orange bell peppers, and minced garlic. Sauté for about 5 minutes until onions are translucent and peppers are soft.
Add 1 pound of lean ground beef to the skillet. Break apart with a spatula and cook until browned, about 6-8 minutes. Drain excess fat if necessary.
Stir in ground cumin, chili powder, smoked paprika, onion powder, salt, pepper, cayenne pepper, and reserved tablespoon of diced green chiles. Cook for about 1 minute to release flavors.
Pour in 1/3 cup low-sodium beef stock or water. Stir and let simmer for a few minutes until mixture thickens slightly.
Spread a generous layer of tortilla chips on a large sheet pan. Spoon beef mixture evenly over chips, then sprinkle freshly grated Monterey Jack cheese on top.
Bake in the preheated oven for 10-15 minutes, until cheese is melted and bubbly.
Remove from oven and top with sliced avocado, chopped cilantro, thinly sliced radishes, chopped cherry tomatoes, and a drizzle of fresh salsa.
Serve hot with dollops of sour cream, lime wedges, and any remaining salsa on the side.