Preheat oven to 450°F , grab 2 large sheet pans and lightly spray them with cooking oil. Cook your rice in whatever way you prefer, or simply use leftover rice and reheat later.
Chop all your veggies of choice, about 4 to 6 cups, and tofu and dump on the sheet pans. Season the tofu directly on the pan with 1 tbsp of soy sauce or tamari, salt and ½ tsp onion powder, and gently toss with your hands. Lightly spray the veggies with cooking oil and a dash of salt.
Roast for 20-25 minutes, flipping halfway, until the veggies are crisp-tender or cooked to your liking, and the tofu is golden brown.
Mix together the gochujang sauce. Assemble your bowls with cooked rice, veggies and tofu and a drizzle of the gochujang sauce, then mix it all together.
Garnish with chopped green onions and sesame seeds and enjoy your delicious sheet pan bibimbap!