In a medium bowl, toss the shrimp with olive oil, chili powder, garlic powder, salt, and pepper until well coated.
Heat a skillet over medium-high heat. Add the shrimp and cook for 2-3 minutes on each side, or until they are pink and opaque. Remove from heat.
In another bowl, combine the diced mango, red onion, red bell pepper, lime juice, and cilantro. Mix well to create the mango salsa.
To assemble the bowls, divide the cooked quinoa or rice among four bowls. Top each bowl with diced avocado, cooked shrimp, and a generous scoop of mango salsa.
Serve immediately and enjoy!