Begin by washing the bell peppers thoroughly. Cut the tops off the peppers and remove the seeds and membranes to create hollow shells.
In a grill pan or skillet, heat the olive oil over medium heat. Briefly grill the hollow bell peppers for about 2-3 minutes on each side until slightly softened. Remove from heat and let them cool.
Once the bell peppers have cooled enough to handle, spread a generous layer of hummus inside each pepper.
Layer the sliced cucumbers, tomatoes, lettuce, and avocado inside the hummus-filled peppers. If using cheese, add it on top of the vegetables.
Season with salt and pepper to taste.
Serve each stuffed bell pepper on a plate and enjoy your colorful and flavorful sandwich!
For added flavor, consider adding herbs or sliced olives into the peppers.
Customize the filling based on your preferences; grilled chicken or tuna can be great protein additions if desired.
These sandwiches can also be prepared ahead of time and stored in the refrigerator for a quick meal on busy days.