In a mixing bowl, add the drained and rinsed chickpeas. Using a fork or potato masher, mash the chickpeas until they are mostly smooth but still have some texture.
Stir in the hummus, starting with 3 tablespoons and adding more to taste. Season with sea salt until you achieve the desired flavor.
Toast your gluten-free bread slices until golden brown and crispy, which will provide a perfect base for your sandwich.
On one slice of toasted bread, spread a generous portion of the hummus-chickpea mixture. Layer on the sliced avocado, fresh tomato, mixed greens or spinach, and red onion. Top with another slice of toasted bread.
Cut the sandwiches in half, if desired, and serve with your favorite side. Enjoy the delicious flavors and textures!