Easy Authentic Spanish Rice

6 tablespoons butter

2 onions, chopped

2 jalapeno peppers, chopped

2 (14.5 ounce) cans Mexican-style diced tomatoes, undrained

1 cup uncooked white rice

salt and ground black pepper to taste

½ cup sour cream, or as desired

½ cup shredded Cheddar cheese, or as desired

Melt butter in a large skillet over medium-high heat; cook and stir onions and jalapeno peppers in the butter until softened, 3 to 5 minutes. Stir Mexican-style tomatoes into onion mixture; add rice, salt, and black pepper. Bring rice mixture to a boil, reduce heat, cover, and simmer until rice is cooked, 40 to 45 minutes. Garnish with sour cream and Cheddar cheese to serve.