Heat the water for the tortellini according to package directions.
While the water for the tortellini is heating, sauté the onion and red pepper in olive oil in a large frypan until tender. Add the garlic and sauté a couple more minutes. Add the peas and heat through.
Remove vegetables from skillet and set aside. Melt butter in the same skillet and add wine. Simmer the butter and wine together for a minute or two, then add half and half and mix well.
Add the tortellini to the boiling water as you are finishing up the vegetables and sauce.
Gradually add in the Parmesan cheese to the sauce, mixing well.
Season the sauce with salt and fresh basil to taste.
After the tortellini is finished cooking, drain it and return it to the pan.
Add the sauce and vegetables, mix well, and serve.