Preheat oven to 400 degrees F.
In a large plastic zip-top bag, combine brown sugar and mustard. Add bacon and toss to coat.
Line a baking sheet with aluminum foil or parchment paper. Place a cooling rack on the lined baking sheet. Put bacon on rack and roast in oven for 20 minutes. Let drain for a few minutes on the rack and serve.
Recipe courtesy of Katie Lee Joel