Melt butter in a heavy saucepan over medium heat. Add garlic. Sauté over medium heat until garlic starts to disintegrate (about 5 minutes). Continue to stir to cook evenly.
Pour in cream and shredded Parmesan cheese. Whisk until blended and smooth, approximately 4 minutes.
Add salt and pepper to taste, continue to whisk.
Add roasted red pepper, peas and shrimp. Heat for 2 minutes. Sauce will lightly coat the back of a spoon, but not be globby or heavy. The sauce will separate if over heated, so do not raise heat above medium.