Preheat oven to 425F.
Toss sweet potatoes with 3 Tbsp. olive oil, paprika and chili powder. Spread potatoes evenly out on foil-lined baking sheet and bake for 20 minutes. Remove from oven.
Toss bell peppers with remaining 1 Tbsp. olive oil.
Flip sweet potatoes and add bell peppers to baking sheet. Bake for 15-20 minutes or until potatoes are tender.
Combine mayonnaise, lime juice, cumin, paprika chili powder, and hot sauce in small bowl. Whisk until fully incorporated. Refrigerate until ready to serve.
Allow roasted vegetables and rice to cool before serving.
To assemble bowls, fill with ½ cup of cooked rice, top with roasted vegetables and black beans. Garnish with avocado and cilantro, if desired. Serve with dressing on the side.