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Funfetti Skillet Cookie

Ingredients
  

  • 1/2 cup unsalted butter softened
  • 3/4 cup granulated sugar
  • 1 large egg
  • 1 egg yolk
  • 2 teaspoons vanilla extract
  • 1 1/2 cups all-purpose flour
  • 1/4 teaspoon salt
  • 1 teaspoon baking powder
  • 1/2 teaspoon baking soda
  • 1 1/2 teaspoons cornstarch
  • 2/3 cup white chocolate chips
  • 1/2 cup rainbow sprinkles