Preheat oven to 400 degrees.
Melt butter in a skillet in the oven.
Add macaroni shells to boiling water. Boil 5 minutes. Drain
Cook bacon 3-4 minutes each side. It will not be done.
Add macaroni shells to mixing bowl. Add in cheese packet that came in mac & cheese box. Mix well.
Add egg, whipping cream, and cheese. Mix well.
Add ground mustard, onion powder, and garlic powder. Mix well.
Remove skillet from oven. Pour mac & cheese in skillet.
Add bacon to the top. I weave mine like a lattice.
Bake in the oven for 15 minutes. Remove and top with shredded cheddar cheese.
Place back in oven and turn oven on broil. Broil until cheese is melted and bacon is browned around the edges. My oven took about 3 - 4 minutes.
Remove and enjoy!