Cook rice or quinoa according to package instructions. Set aside.
Season shrimp with chili powder, cumin, garlic powder, salt, and black pepper.
Heat 1 tablespoon olive oil in a pan over medium heat. Cook shrimp for 2–3 minutes per side until pink. Remove from heat.
In a bowl, combine diced avocado, mango, red onion, cilantro, and jalapeño (if using).
Drizzle lime juice over the mixture and gently toss.
Whisk together olive oil, lime juice, honey or maple syrup, salt, and pepper for the dressing.
Assemble bowls with rice or quinoa, shrimp, and avocado-mango mixture.
Drizzle dressing over the top and serve immediately.