Place chicken in an ovenproof dish and add half cup chicken broth. Bake at 180ºC . for about 10 minutes on each side, or until chicken is slightly pink. Reserve chicken broth and cut breasts across the grain into medium-size slices. Let cool. In a saucepan, melt butter, add flour and stir. With a whisk, add milk, cream or half and half. Stir in one cup of chicken broth and then add reserved broth from cooked chicken. Add Parmesan cheese, garlic powder, pepper, peas, basil and chicken. Simmer until chicken is cooked through. Pour sauce over fettucini. Serve immediately.