In a medium bowl, combine roasted corn, red onion, cilantro, mayo, sour cream, minced garlic, Tajin, lime juice, salt, and pepper. Mix well and set aside. This is your street corn salad topping.
Spread a thin, even layer of ground beef on the top of each tortilla, making sure to go right up to the edges of the tortilla.
Season with taco seasoning. Repeat with the remaining 7 tortillas.
Heat your large skillet over medium-high heat. Place tortillas meat side down and cook until browned and crisp. Flip and toast the other side for 1–2 minutes.
Add a slice of cheese on top to melt while the tortilla crisps. Repeat with remaining tortillas.
Top each taco with your prepared street corn salad.
Finish them off with cotija cheese, avocado ranch, and additional cilantro if desired.
Serve immediately and enjoy! Street corn, meet tacos!