Heat oil in a large skillet over medium heat. Add onion and peppers and sauté until the onion is translucent, 2-3 minutes. Add garlic and sauté until fragrant, 1-2 minutes.
Add quinoa and beans and toss to combine. If the mixture feels dry, add a splash of water to loosen it up.
Add seasonings and hot sauce (if using) and cook for another 1-2 minutes, until hot.