My vegetarian friend gave me this recipe to use on a cake for her once. She says it tastes the most like canned icing to her and it's her favorite. I think it tastes better than canned personally but you can try it if you like. You can use all Crisco if you want to and just use regular vanilla flavor instead of vanilla butter flavor to eliminate the buttercream like flavor and it will taste like canned. When I use all Crisco, I still add the 1.4 tsp of salt to cut the sweetness some.
Krogers brand is just a brand name they sell at Foods Co. that she's a fan of. I doubt it matters which brand you use.
4 cups of sifted confectioners sugar
1/2 cup of Crisco (vegetable shortening)
½ cup of salted butter
¼ teaspoon of popcorn salt (or table salt)
2 tablespoon of water
1 teaspoon of Krogers brand vanilla butter flavoring or regular vanilla flavoring
Combine sugar, salt, shortening, butter, and vanilla. Beat on low for 1 min. then beat on med. speed for about 6 minutes. Thin with corn syrup or water if needed.
Makes about 5 cups of icing