Frosted Lemon Sugar Cookies

Step 1
Preheat the oven to 350 degrees F (175 degrees C).

Step 2
Beat butter in a bowl with an electric mixer until creamy. Add 1 cup sugar, vegetables oil, lemon juice, and vanilla extract; mix to combine. Add egg and mix until thoroughly incorporated.

Step 3
Sift together flour, cream of tartar, baking soda, and salt in a bowl. Add flour mixture to the butter mixture; mix until well combined.

Step 4
Pour 1/4 cup sugar into a small bowl. Form dough into 1-inch balls. Roll each ball into sugar to coat and place on an ungreased baking sheet.

Step 5
Bake in the preheated oven until lightly browned, about 10 minutes. Remove from oven, transfer to a wire rack and cool completely, about 30 minutes.

Step 6
Mix together powdered sugar and lemon juice for the frosting in a small bowl until smooth. Pour frosting over cookies and allow to harden for at least 5 minutes before serving.