From the Bayou Crawfish Etouffee

1/4 pound butter
4 cups chopped onions
2 cups chopped green peppers
1 1/2 teaspoons fresh chopped garlic
4 cups sliced mushrooms
1 1/2 teaspoons flour
Salt and pepper to taste
1 tablespoon cayenne pepper
4 dashes Tabasco sauce
1 tablespoon garlic powder
2 cups whipping cream
1 cup half-and-half
1 3/4 cups tomato sauce

Melt butter in large heavy-duty pot. Add onions, peppers, garlic and all seasonings. Saut