Preheat oven to 450 degrees f.
Pour the avocado oil into a large oven safe skillet and heat over medium-high heat. Line a plate with a couple of paper towels and set nearby.
When the oil is hot, shimmering, and just starting to smoke, add the tortilla strips and fry, stirring occasionally and moving them around the pan, until they are crisp and lightly colored, about 2 -4 minutes. Carefully remove with a slotted spoon or tongs to the paper towel lined plate and sprinkle lightly with salt while they are still hot.
Remove all but 1 tablespoon oil from the pan, and reduce heat to medium. Add diced onion and peppers. Season with salt and pepper to taste, and cook, stirring occasionally, for 3-5 minutes, until slightly softened.
Move the peppers and onions to the outer edges of the pan. Add the ground beef and cook, breaking up as you go with a wooden spoon or spatula, until browned and no pink remains, 4-5 minutes. Drain off any excess grease using paper towels to blot the excess, then discarding.
Add the spices to the pan and stir to combine with the beef, peppers, and onions.
Cook 1 minute, until fragrant.
Add the salsa, diced chilis and drained pinto beans, stir to combine, and simmer 5-7 minutes, stirring occasionally, until warmed through.
Turn off heat and layer tortilla strips over top in an even layer, then sprinkle cheese over top.
Bake in preheated oven on the top rack for 5-6 minutes, until cheese is melted and lightly browned.