Place the onion rings on a baking sheet in a single layer.
Place the zucchini, bell pepper and mushrooms on another baking sheet in a single layer.
Stir together the tamari, garlic powder and smoked paprika.
Drizzle over the onions and other vegetables.
Use your hands to fully coat the onions and vegetables with the tamari.
Roast at 400° for 15-20 minutes.
Blend together in a food processor or blender until smooth.
Assemble the sandwiches by toasting the bread.
Layer the roasted vegetables and onions on the bread.
Top with sliced avocado.
Spread the sandwich dressing on the top piece of bread.
The roasted onions drizzled with tamari and seasonings add a wonderful flavor to these sandwiches.
You won’t think you’re eating bacon, but they add that kind of full-body flavor.