Instant Pot Beef Chili

Name: Instant Pot Beef Chili
Ingredients: 1 tablespoon olive or vegetable oil; 1 medium green bell pepper, chopped; 1 medium yellow onion, chopped; 2 ribs celery, chopped; 1 clove garlic, finely chopped; 1 pound ground beef (85% lean); 2 tablespoons chili powder; 1 1/2 teaspoons salt; 1/2 teaspoon oregano; 3 tablespoons tomato paste; 1 (14-ounce) can diced tomatoes; Water or broth, as needed to make 1 cup liquid with the tomato juices; 1 (15.5-ounce) can kidney beans , drained and rinsed; 1 cup shredded cheese, any favorite mix, to serve; 2 green onions , sliced thinly, to serve; Rice , cornbread, or garlic knots, to serve