Combine 3 cups milk, flour, salt and pepper in a jar. Shake, covered, until flour is dissolved. Pour into a skillet. Simmer for 15 minutes, stirring constantly.
Brown sausage in separate skillet, stirring until crumbly; drain. Add to gravy, stirring occasionally.
Mix biscuit mix with remaining 3/4 cup milk in bowl until soft dough forms. Drop by spoonfuls onto ungreased baking shee Tbsp Bake at 450° F or 10 minutes or until brown.
Ladle sausage gravy over split biscuits.Servings: 10