Preheat oven to 425°F
Mix seasoning for sweet potatoes in large bowl: garam masala, brown sugar, garlic powder, cinnamon, salt, and pepper
In large bowl, toss sweet potatoes with seasoning and grapeseed oil
Spread seasoned sweet potatoes out on 9x13" baking sheet. Evenly distribute sliced bacon. Shake pan and make sure everything is in a single layer on baking sheet.
Roast for 40 minutes at 425°F, flipping bacon and potatoes halfway through. If bacon isn't crisp enough at the end of cooking time, broil for 1-2 additional minutes. Watch closely to avoid burn.
Serve sweet potatoes as is, or sprinkle with parsley or cilantro