Preheat a large skillet to medium-high heat.

Add olive oil to the skillet.

Add ground beef and ground chorizo to the skillet.

Season with salt and pepper to taste.

Sauté the beef and chorizo until cooked through, about 7 minutes, breaking up the meat as it cooks.

Drain any excess liquid from the skillet and set the cooked meat aside.

Prepare the chipotle mayo by mixing mayonnaise and chipotle adobo sauce in a bowl.

To assemble the tacos, place some of the chorizo/beef mixture onto a flour tortilla.

Top the meat mixture with prepared chili, shredded cheddar cheese, Fritos, jalapeno slices, and serrano chile slices.

Garnish with a dollop of chipotle mayo on top.

Repeat the process until all the meat mixture has been used.