Prepare the rice first following package or coconut rice directions; keep warm.
Adjust the oven rack so it is about 6 inches from the broiler and preheat the broiler to high; line a sheet pan with foil.
Trim excess fat from the chicken and cut into 1-inch pieces, then pat dry with paper towels.
In a large bowl, combine the chicken with paprika, 1 teaspoon garlic powder, salt, onion powder, black pepper, and cornstarch; toss with tongs to coat evenly.
Drizzle the olive oil over the coated chicken and toss again to distribute the oil.
Thread the chicken pieces onto skewers and arrange them spaced apart on the prepared sheet pan.
Broil the skewers for about 12 minutes, turning once if desired, until golden brown and the internal temperature reaches 160°F; remove from oven and adjust seasoning if needed.
While the chicken cooks, whisk together the sauce: mayonnaise, sweet chili sauce, 1/2 teaspoon garlic powder, and soy sauce until smooth.
If using the avocado-cucumber salad, combine diced avocado and diced English cucumber as described in the notes and toss with honey, olive oil, lime juice, and a pinch of salt and pepper.
Divide the cooked rice among 4 bowls, top with the chicken skewers and salad if using, then drizzle or brush the bang bang sauce over the chicken and serve; squeeze lime over as desired.