Pierce potatoes with a fork; arrange on paper towels in microwave oven. Microwave at high 16 minutes or until done, turning and rearranging potatoes after 8 minutes.
Let stand 5 minutes.
While potatoes cook, cook bacon in a large nonstick skillet over medium heat until crisp.
Remove bacon from pan; reserve 1 teaspoon drippings in pan. Crumble bacon; set aside.
Add broccoli, mushrooms, onion, and garlic to drippings in pan; cook 7 minutes or until tender, stirring frequently.
Remove from heat.
Cut each potato in half lengthwise; scoop out pulp, leaving a 1/4-inch-thick shell.
Combine potato pulp, onion mixture, cheese, and remaining ingredients; divide evenly among shells.
Bake at 450 for 8 minutes or until potatoes are thoroughly heated.