Description

These iconic Swig-style sugar cookies feature a unique blend of butter and oil for a soft, melt-in-your-mouth texture finished with signature ruffled edges. Topped with a thick, creamy sour cream frosting, they are the ultimate chilled treat for any occasion.

Ingredients

1 cup salted butter, softened
3/4 cup vegetable oil
1 1/4 cups granulated sugar
3/4 cup powdered sugar
2 tablespoons sour cream
2 large eggs
1 teaspoon vanilla extract
5 1/2 cups all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon cream of tartar
1/2 teaspoon salt
Extra granulated sugar for pressing
1/2 cup butter, softened (for frosting)
2 tablespoons sour cream (for frosting)
4 cups powdered sugar (for frosting)
1 teaspoon vanilla extract (for frosting)
1-2 tablespoons milk (for frosting)
Sprinkles for garnish

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Instructions

Preheat your oven to 350 degrees F (175 degrees C) and line baking sheets with parchment paper.
In a large stand mixer bowl, combine softened butter, oil, granulated sugar, powdered sugar, baking soda, cream of tartar, and salt; beat for 1–2 minutes until creamy and smooth.
Add the sour cream, eggs, and vanilla extract to the bowl and mix for another 1–2 minutes until well combined, scraping down the sides as needed.
Gradually incorporate the flour into the wet ingredients, mixing just until no dry streaks remain to ensure a tender crumb.
Scoop the dough into 3-tablespoon balls and place them on the prepared baking sheets.
Dip the bottom of a flat glass in granulated sugar and press each dough ball down to 1/4 to 1/2 inch thickness, allowing the edges to crack and ruffle.
Bake for 7–9 minutes until the edges are just set but not browned; the centers should still look slightly underbaked.
Allow the cookies to cool completely on the pan before frosting.
Whip the frosting ingredients together until smooth and fluffy, then spread a generous layer over each cooled cookie and add sprinkles if desired.

Notes

For the most authentic bakery experience, serve these cookies slightly chilled, which gives the frosting a fudgy texture and keeps the cookie base soft and dense. If you find the dough sticking to your glass during the pressing stage, ensure you dip it in granulated sugar before every single cookie for a clean release.

Prep Time: 20 mins
Cook Time: 8 mins
Category: Dessert
Method: Baking
Cuisine: American