Preheat your oven to 400 degrees Fahrenheit and prepare a large baking sheet by lining it with parchment paper.
In a large bowl, add together the grapes, brussels sprouts, both oils, maple syrup, and seasonings, mixing everything together until coated.
Add the grapes and brussels sprouts unto the baking sheet (in a single layer) and bake for 20-25 minutes.
Add the walnuts and pecans unto the baking sheet with the grapes and continue to bake for 15-20 minutes until grapes and brussels sprouts are charred, wilted, and tender while nuts are fragrant and golden.
Remove from oven and let cool slightly before serving.
To serve, add all ingredients unto a platter and drizzle with balsamic vinegar and/or maple syrup, if desired.
Bon Appetit!
Notes
STORAGE: All leftovers can be stored in an airtight container and refrigerated for 3-4 days.