Heat the oil in a large skillet over medium-high heat. Add the bell pepper, broccoli, snow peas, and ginger. Cook for 3-4 minutes until vegetables are tender.
In a small bowl, whisk together the peanut butter, soy sauce, and rice vinegar.
Add the peanut butter mixture to the skillet and stir to combine. Cook for 1-2 minutes until everything is heated through.
Serve with cooked rice or quinoa.
Garnish with chopped peanuts and fresh cilantro leaves if desired.