Preheat oven to 425 degrees.
In a small mixing bowl add shredded or chopped chicken with 3/4 cup sweet chili sauce, set aside.
In a small skillet add olive oil and set over medium-high heat.
When the oil is hot add the red onion and red bell pepper.
Saute until the onions and bell pepper have just softened.
Remove from the heat and set aside.
Line a rimmed baking sheet with parchment paper and place half of the bag of corn tortilla chips.
Top with half the chicken, half the peppers and onions, and half the Mexican blend shredded cheese.
Add to the oven and cook for 5 minutes.
Remove from the oven and top the nachos with the remaining chicken, peppers, onions, and Mexican blend cheese.
Add back to the oven and bake for 5-10 minutes or until the cheese is melted and lightly browned.
Remove from the oven and top with prepared guacamole, crumbled Cotija cheese, and minced cilantro.
Drizzle with the 1/4 cup remaining sweet chili sauce.
Serve immediately.