Preheat oven to 400°F and line a baking sheet with parchment paper.
Add brussels sprouts into a bowl and toss with the oil, chopped pecans, garlic, and salt and pepper.
Add the brussels sprouts and pecans onto the lined baking sheet and add the bacon.
Roast in the oven for 15-20 minutes and flip halfway.
Remove from the oven, add fresh parsley and enjoy!