Easy Vegan Bean Burritos

Name: Easy Vegan Bean Burritos
Ingredients: 1 tablespoons olive oil; 1 small onion (chopped); 2 cloves garlic (minced); 1/2 medium green bell pepper (finely diced); 3 cups well-cooked pinto beans (from about 1 cup raw, or two 15- to 16-ounce cans, drained and rinsed); 1 to 2 small fresh hot chile peppers (seeded and minced, or one 4-ounce can chopped mild green chiles); 2 to 4 tablespoons minced fresh cilantro (to taste); 1 teaspoon ground cumin; Salt to taste; Cooking liquid from the beans (or water, as needed); 8 burrito-size (10- to 12-inch flour tortillas); 1 cup firmly packed cheddar-style non-dairy cheese; Salsa (as desired); Shredded lettuce for garnish; Black olives for garnish