Mash avocados the clean and easy way: Place halves in a heavy-duty zip-top plastic bag; seal and squeeze.
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8 slices sourdough bread, toasted
2 tablespoons mayonnaise
2 avocados, peeled and mashed
8 slices purple onion
4 (1-ounce) slices Monterey Jack or provolone cheese
8 slices bacon, cooked
8 lettuce leaves
8 slices tomato
8 (1/4-inch-thick) slices roasted chicken breast
1/8 teaspoon salt
1/8 teaspoon pepper
Spread 1 side of each bread slice evenly with mayonnaise; spread half of slices with mashed avocado, and top with onion and next 5 ingredients. Sprinkle with salt and pepper. Top with remaining bread slices; serve sandwiches immediately.