Place potatoes on a microwavable plate. Pierce several times with fork. Microwave on high for 6 to 8 minutes, or until tender. When cool enough to handle, cut a thin slice off the top of each potato and discard. Scoop out pulp of each, leaving a thin shell. In a bowl, mash the pulp with sour cream. Stir in cheese, broccoli, bacon, garlic salt and lemon pepper. Spoon into potato shells. Microwave, uncovered, on high for 1 to 2 minutes, or until heated through.