Preheat oven to 425 degrees F.
In a medium mixing bowl, toss the Brussels Sprouts with the olive oil.
Spread evenly on a large baking sheet - Brussels Sprouts should not be overlapping or too crowded.
Season, to taste, with salt and pepper.
Place the baking tray in the oven on the middle rack.
Roast for 20 - 25 minutes, stirring halfway through, until the Brussels Sprouts are cooked and golden brown.
While the Brussels Sprouts are roasting, cook and crumble the bacon. I prefer to use this method: How to Make Homemade Bacon Bits.
Remove the bacon from the grease using a slotted spoon.
Set aside 1 teaspoon of bacon grease.
Whisk together the reserved bacon grease and the balsamic vinegar.
Toss with the cooked Brussels sprouts and the crumbled bacon.
Serve immediately.
