Prepare the mango salsa by combining diced mango, red onion, japapeño (if using), lime juice, cilantro, and a pinch of salt in a bowl. Mix well, and set aside in the refrigerator.
Make the lime-chili sauce by whisking together Greek yogurt, mayonnaise, chili powder, lime zest and juice, honey, salt, and pepper. Adjust seasoning to taste and set aside.
Pat the shrimp dry and season with chili powder, garlic powder, salt, and pepper. Heat a grill pan or skillet over medium-high heat with a drizzle of olive oil. Cook the shrimp for 2-3 minutes per side until pink and slightly charred.
Assemble the bowls by adding a base of cooked rice or quinoa to each bowl. Arrange grilled shrimp, sliced avocado, and mango salsa on top.
Drizzle lime-chili sauce generously over the bowls. Garnish with chopped cilantro, and serve with lime wedges on the side.
Enjoy immediately!