Place broccoli in microwavable bowl with 3 tablespoons water. Cover with plastic wrap and vent. Microwave on high for 1 minute. Drain water and chop broccoli.
Bake potatoes until tender approximately 1 hour. Allow to cool for 30 minutes. Slice potatoes in half and scoop the insides into a large bowl, leaving about ¼ of an inch around the shell. Place empty shells back in the oven for about 10 minutes to crisp up.
In large bowl with potatoes combine sour cream, onion powder, garlic powder, milk, cheddar and provolone. Mash until smooth. Fold in 3/4 of the bacon and broccoli. Top with the remaining bacon & broccoli.
Divide mashed mix evenly between the shells. Top with remaining bacon and broccoli. Bake for 20 minutes turning on the broiler the last minute of cooking.