Heat a large saute pan to medium-high, swirl a tablespoon of olive oil. Saute onions and mix in ground meats. Cook until lightly browned. Tilt the pan and scoop out any accumulated fat (or take a bunch of paper towels and let them soak it up. Discard the fat.
Mix dry ingredients in a small bowl. Sprinkle mixed spices onto the cooked meat. Pour in chili beans. Heat for about 10 more minutes, and your taco filling is ready.
Set up a "fixings" table with a bowl of the taco meat and desired taco fillings, and let each person fill their Fritos bag with whatever fixings they'd like.
Notes
Calories were calculated without any of the additional toppings.