Place rice in a strainer and rinse under cool water until water runs clear.

Transfer to a medium pot.

Cook rice over medium-low heat, stirring gently, until fragrant and toasted, 3 to 5 minutes.

Add 4 cups salted water, cover and bring to a boil.

Reduce heat to medium-low and simmer, covered, until water is absorbed, about 40 minutes.

Uncover pot, fluff rice and set aside.

Heat oil in a large skillet over medium-high heat.

Add onions and cook until just soft, 1 to 2 minutes.

Add peppers, garlic and chili powder and cook, stirring occasionally, until softened, 2 to 3 minutes.

Add diced tomatoes with their liquid and bring to a boil.

Reduce heat to medium-low and simmer for 15 minutes.

Stir in beans, then simmer until flavors are melded, about 5 minutes more; season with salt and pepper.

Spoon beans over rice, garnish with cilantro and lime wedges and serve.