Preheat oven to 400° F.

Toss brussels sprouts in olive oil and season generously with salt and pepper. Place them in a large baking dish and roast for 15-20 minutes, or until semi-softened.

In a large bowl whisk together egg, cream, rosemary, garlic powder, onion powder and red pepper flakes. Then stir in cheese.

Remove brussels sprouts from oven and add 3/4 bacon to the baking dish. Pour cheese mixture over the top and stir everything together, then top with remaining bacon.

Reduce oven temperature to 350° F, return baking dish to oven and bake for 20-25 minutes, or until cheese is bubbly.

Remove from oven and let cool 5 minutes before serving.