In a large bowl, combine the Brussels sprouts, butternut squash, carrots, and red bell pepper.
In a separate small bowl, whisk together the olive oil, maple syrup, Dijon mustard, garlic powder, smoked paprika, salt, and pepper until well combined.
Pour the maple Dijon mixture over the vegetables and toss until they are evenly coated.
Spread the vegetables in a single layer on a large baking sheet lined with parchment paper.
Roast the vegetables in the preheated oven for 25-30 minutes, or until they are tender and caramelized, stirring halfway through for even cooking.
Once done, remove the baking sheet from the oven and let the vegetables cool slightly before garnishing with fresh parsley.