Bacon Avocado Grilled Cheese Sandwiches

slices sourdough bread ( , sliced 3/4 inch thick)

slices bacon ( , cooked and cut in half)

sharp cheddar cheese (, shredded)

provolone cheese ( , shredded)

Gruyere cheese ( , shredded)

guacamole

lime wedges

fresh tomato ( , sliced)

butter