Preheat oven to 375°F and lightly grease a 9x13 inch baking dish.

Heat olive oil in a large skillet over medium-high heat. Add diced onion and cook until softened, about 4 minutes. Add garlic for the last 30 seconds until fragrant.

Add ground beef to the skillet, breaking it up with a wooden spoon. Cook until browned and no pink remains, 6 to 8 minutes. Drain excess grease if needed.

Stir in taco seasoning, black beans, and diced tomatoes with green chilies. Simmer for 5 minutes to meld flavors.

Remove from heat and fold in cream cheese and 1 cup shredded cheese until cream cheese is melted and mixture is cohesive.

Transfer mixture to prepared baking dish and spread evenly. Top with remaining 1 cup cheese.

Bake for 15 minutes until cheese is bubbly. Add Fritos and bake 5 more minutes, or add chips right before serving for maximum crunch.

Let cool 5 minutes, then serve with desired toppings like lettuce, tomatoes, sour cream, and cilantro.