Mexican three bean and tomato burrito recipe

Name: Mexican three bean and tomato burrito recipe
Ingredients: 400 g can red kidney beans; 400 g can butter beans; 400 g can black beans; 400 g can cherry tomatoes; 1⁄2 cup sliced roasted red capsicum (pepper); 1 small red onion, thinly sliced; 1 clove garlic, crushed; 2 teaspoons chicken stock powder; 1 tablespoon ground cumin; 1⁄2 teaspoon chilli powder; 1⁄2 iceberg lettuce, shredded; gluten-free flatbreads or tortillas; 2 avocados, diced; large handful coriander leaves; lime wedges, to serve