Pumpkin Spice Muffins with Cream Cheese Frosting

Name: Pumpkin Spice Muffins with Cream Cheese Frosting
Ingredients: 1 c. all-purpose flour; 1/2 c. granulated sugar; 2 tsp. baking powder; 1 1/2 tsp. ground cinnamon; 1/4 tsp. ground ginger; 1/2 tsp. nutmeg; 1/2 tsp. salt; 1/4 c. butter, cut into pieces; 1 c. (heaping) pumpkin puree; 1/2 c. evaporated milk; 1 egg; 1 1/2 tsp. vanilla extract; 1/2 c. golden raisins (optional); 2 tbsp. granulated sugar; 1 tsp. cinnamon; 1/4 tsp. ground nutmeg; 1/4 c. salted butter, softened; 1 oz. cream cheese, softened; 1/2 lb. powdered sugar; 1/2 tsp. vanilla extract