In a large skillet over medium heat, add 1 tablespoon of olive oil. Once hot, add 2 cloves of minced garlic and sauté for about 30 seconds until fragrant. Then, add 1 pound of ground beef. Cook until browned and crumbled, about 6-8 minutes.
Drain any excess fat from the beef. Add 1 teaspoon each of chili powder, paprika, cumin, dried oregano, and cayenne pepper. Stir to coat the beef evenly and cook for another 2-3 minutes, then remove from heat.
Preheat your oven to 400°F (200°C) while you prepare the sheet pan.
On a large sheet pan, spread out the 13 ounces of tortilla chips in an even layer. Top with the seasoned beef mixture, followed by the diced green bell pepper, red onion, and sliced black olives. Sprinkle the shredded Monterey Jack and cheddar cheese evenly over the top.
Scatter the jalapeño slices and diced Roma tomato over the cheese layer for added crunch and heat.
Place the sheet pan in the preheated oven and bake for about 10-15 minutes, or until the cheese is melted and bubbly. Keep an eye on them to avoid burning.
Once out of the oven, garnish the nachos with fresh cilantro. Serve immediately with salsa, sour cream, and guacamole on the side.