Prepare tortellini according to package directions.

Meanwhile, in a large skillet, melt butter over medium heat.

Add julienned sweet red pepper to the skillet and sauté until crisp-tender, about 5 minutes.

Add minced garlic to the skillet and cook for 1 minute, until fragrant.

Stir in heavy whipping cream and cook for 8-10 minutes, or until the sauce has slightly thickened.

Add ground walnuts, minced fresh basil (or dried basil), and chopped green onion to the sauce.

Heat the sauce through, stirring occasionally.

Drain the cooked tortellini.

Add the drained tortellini to the skillet with the sauce.

Toss to coat the tortellini evenly with the sauce.

Serve immediately.