Ingredients

• 3 cups all-purpose flour
• 1 teaspoon baking soda
• 1 1/2 teaspoons baking powder
• 2 teaspoons unsweetened cocoa powder
• 1/2 cups canola oil
• 1 teaspoon white vinegar
• 1 (1-ounce) bottle red food coloring
• 1/2 teaspoon vanilla extract
• 1 1/2 cups sugar
• 2 eggs
• 1 cup buttermilk
• 5 tablespoons all-purpose flour
• 1 cup milk
• 1 cup sugar
• 8 tablespoons butter (1 stick), softened
• 1/2 cup solid vegetable shortening (recommended: Crisco)
• 1 teaspoon vanilla extract

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Instructions

1. Watch how to make this recipe.
2. Pies:
3. Preheat the oven to 350 degrees F. Lightly grease 2 cookie sheets. Sift the flour, baking soda, and cocoa together in a large bowl. In a separate bowl, combine the oil, vinegar, food coloring, and vanilla.
4. Using an electric mixer, beat the sugar and eggs together in a large bowl until they turn pale and double in volume. Add the oil mixture and beat to combine. Add the flour mixture and buttermilk alternately in 5 small additions, starting and ending with the flour.
5. Drop the batter by teaspoons onto the baking sheets, allowing 1-inch between drops, as the cookies will spread. You'll be making 48 cookies. Bake until the cookies are firm but not crisp, about 8 to 10 minutes. Transfer immediately to racks to cool.
6. Filling:
7. Put the flour into a medium saucepan and slowly add the milk, whisking until smooth. Set over medium heat and cook, stirring constantly with a whisk, until very thick, about 3 minutes. Remove the flour mixture from the heat and allow it to cool completely.
8. Cream the sugar, butter, shortening, and vanilla in a large bowl with an electric mixer. Add the cooled flour mixture and whip until fluffy. Spread some filling onto 1 cookie and top it with another to make a sandwich. Repeat with the remaining cookies and filling. Cover the filled whoopee pies with plastic wrap and store in the refrigerator until ready to serve.