Preheat oven to 425 degrees.
Toss diced sweet potatoes with a drizzle of olive oil, and season with salt and pepper. Arrange on a single layer on one half of a large sheet pan. Roast for 10 minutes.
While the sweet potatoes are roasting, slice the onion and bell peppers. Toss the broccoli, onions, and bell peppers with a drizzle of olive oil and salt and pepper. Once the sweet potatoes have roasted for 10 minutes, arrange the bell pepper mixture onto the same baking sheet. You may need to use a second baking sheet to ensure all the veggies are in a single layer. Roast all veggies for another 20-30 minutes.
While veggies are roasting, make the sauce. In a food processor add all sauce ingredients. Blend until smooth.
Serve roasted veggies over brown rice, and drizzle with peanut sauce. Enjoy!
Use any veggies you like in this. Other great options I would use are cauliflower, brussels, and mushrooms.