Brussel Sprouts Au Gratin takes the classic most hated veggie of all time and drowns it in a delicious cheese sauce making it a yummy side dish that is hard to hate!
Preheat oven to 350 degrees. Lightly grease a 2-quart (8x8) casserole dish with nonstick cooking spray.
In a medium-size saucepan, melt butter over medium heat. Whisk in flour to form a roux. Whisk in mustard, onion powder, and salt.
When the paste is warm and bubbly, pour in milk. Heat until mixture thickens.
Remove from heat and stir in cream cheese and parmesan cheese until melted and smooth.
Place the trimmed brussel sprouts in the prepared pan (Note: if your brussel sprouts are large you may need to cut them in half so they are bite-sized). Pour cheese mixture over brussel sprouts.
Bake in the preheated oven for 45 minutes to 1 hour, until brussel sprouts are soft.