Step 1: Preheat your oven to 350°F (175°C) to ensure even baking.
Step 2: In a medium bowl, whisk together the all-purpose flour, baking soda, cream of tartar, and kosher salt. Set aside.
Step 3: In a large mixing bowl, beat the unsalted butter and vegetable oil until creamy. Gradually add 1/2 cup of granulated white sugar, beating until light and fluffy.
Step 4: Add the egg, vanilla extract, and almond extract to the butter mixture and mix until fully combined.
Step 5: Gradually add the dry ingredients to the wet mixture, mixing until just combined. Be careful not to overmix!
Step 6: Form small balls of dough and place them on a baking sheet lined with parchment paper, flattening them slightly.
Step 7: Spray the tops of the cookies lightly with nonstick cooking spray. Bake for 8-10 minutes, until edges are lightly golden. Allow to cool.
Step 8: For frosting, beat the unsalted butter until creamy, then gradually add sifted powdered sugar, heavy cream or milk, and extracts until smooth.
Step 9: Once cookies are cooled, frost each cookie generously and add sprinkles if desired.
Step 10: Enjoy your delicious Easy Frosted Sugar Cookies!