Preheat oven to broil.
Place Mushrooms on baking sheet and drizzle with oil.
Place baking sheet in oven and let mushrooms broil for 5 minutes or until brown.
Remove mushrooms from oven, cool for 5 minutes, and slice into ¼ inch slices.
Spread bread slices evenly with roasted red pepper hummus
In a small bowl, mash avocado with a fork. Add lemon juice, basil, salt, pepper and feta cheese.
Spread the avocado and feta mixture over the red pepper hummus.
Top with red peppers, and mushrooms. Place other slice of bread on top to form a sandwich.
Brush the outside pieces of bread with olive oil and place on hot grill. Grill each side until toasted, about 2-3 minutes. Serve immediately.