Cook and stir green bell pepper and yellow onion in a skillet over medium heat with olive oil and chicken broth until onion is translucent, about 5 minutes.
Cut up ground beef into small pieces; place into a separate skillet over medium heat. Cook and stir ground beef with taco seasoning until beef is browned and crumbly, 5 to 8 minutes. Drain excess grease.
Sprinkle roma tomatoes with salt in a bowl. Place Cheddar cheese into a separate bowl.
Fill each lettuce leaf with about 2 tablespoons beef filling; top with 1 to 2 teaspoons green pepper mixture, roma tomato, about about 1 1/2 tablespoons Cheddar cheese.
Measurements are approximate and can be adjusted to your tastes. All ingredients can be customized to your preferred taco toppings. This could also work especially well with iceberg lettuce.
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