Shell and devein shrimp, rinse with cold water. Rinse scallops to remove sand from crevices. Pat shrimp and scallops dry with paper towels. Slice mushrooms.
Ina 12-inch skillet over medium high heat, in 2 T hot butter, cook shrimp and scallops, stirring frequently until pink and tender about 5 min. With slotted spoon removed shrimp and scallops to bowl.
To drippings in skillet add 1 more T hot butter, mushrooms and sherry. Cook, stirring frequently until mushrooms are tender.
In cup, stir flour, pepper bouillon and 1 cup water until blended. Stir into mushrooms. Cook mushroom mixture stirring constantly until sauce boils and slightly thickens.
Reduce heat to low and stir in sour cream. Return shrimp and scallops to skillet and cook over low heat, stirring constantly until shrimp and scallops are hot (don’t boil).
Pour mixture into serving bowl and garnish with parsley.
Can also be served over your favorite pasta.