Preheat oven to 375 degrees.
Put shrimp in a large bowl and toss with olive oil, chili powder, garlic powder, cumin, salt, and pepper.
Heat a large skillet over medium-high heat and when hot add shrimp. Cook until pink and opaque, about 2 minutes per side. Remove from pan to cutting board and when slightly cooled, chop into pieces. I like to leave a few with tails on to top the nachos with.
Layer half the chips on the bottom of a ¼ baking sheet. Sprinkle on half the cheese, red pepper, red onion, tomatoes, corn, and black beans. Top with half the chopped shrimp.
Layer on remaining chips and top with remaining cheese, red pepper, red onion, tomatoes, corn, black beans, and chopped shrimp, along with jalapeños. Add on shrimp with tails if using.
Bake for about 10 minutes, until cheese is melted and getting bubbly.
Remove from oven and top nachos with chopped avocado, cilantro, and dollops of sour cream.