Tips To Make Quinoa Stuffed Peppers. Preheat oven to 350 degrees F. Heat oil in a medium saucepan over medium-high heat. I often make a big batch of quinoa at the start of the week as it keeps well in the fridge for around 5 days. Cut in half. 1 green pepper. Want to Make Vegetarian Quinoa Stuffed Peppers?. 1 1/2 cups quinoa. Directions: Rinse the peppers, take out their stems and the seeds. salt & pepper. 1 tablespoon olive oil. Buy pre-cooked quinoa to cut down on cooking time. Add onion and garlic; cook, stirring occasionally, until the onion is translucent, 4 to 5 minutes. 1 yellow pepper. 1 red pepper. 1/2 cup grated Parmesan. 1 orange pepper. 1 onion. To make these quinoa stuffed peppers vegetarian-friendly, just swap out the ground beef for a can of black beans and use vegetable … 2/3 cup ricotta. Put the peppers … I can then grab it and use it in recipes whenever I need. Make these stuffed peppers … 1 bunch of parsley.