Preheat oven to 400 degrees. Lightly coat large sheet pan with olive oil baking spray. Set aside.
Heat olive oil in skillet over medium to high heat. Add ground turkey and garlic. Brown ground turkey, crumbling the turkey as it cooks, about 4-5 minutes. Stir in taco seasoning. Drain excess fat.
Scatter tortilla chips in a single layer over prepared baking sheet. Top with ground beef mixture, corn, and cheese.
Place in preheated oven and bake until cheese has melted, about 5-6 minutes.
Top with salsa, tomatoes, avocado, red onion, and cilantro. Put generous dollops of sour cream in the middle of the nachos and serve immediately. You'll want to get dibs on the best chips right away!