To make Copycat Lofthouse Sugar Cookies, start by creaming together your butter, sugar and shortening until light and fluffy. Add in the vanilla and almond extract. Mix in the egg and egg white until well combined.
In a small mixing bowl, combine cake flour, all purpose flour, baking powder, salt and cream of tarter. Gradually add the dry ingredients to the wet ingredients and mix until combined. Cover with plastic wrap and move to chill in the refrigerator for 2 hours.
Once chilled, remove and preheat oven to 375 degrees. Line a baking sheet with parchment paper and set aside. Using a cookie scooper or a large spoon, scoop up cookie dough and roll into a 2 inch ball (about 3 tablespoons). Lightly roll your cookie ball through a bowl of all purpose flour, making sure the entire ball is lightly coated in the flour. Move the cookie ball to your baking sheet and using the bottom of a glass or any other flat surface, press the ball flat so that it is about only about 1/2 inch thick. Place in oven and back for 10 - 12 minutes. Remove from the oven and let cool for 1 minute before moving the cookies to a cooling rack.
Once your Copycat Lofthouse Sugar Cookies are completely cooled, make your buttercream frosting. In a medium sized bowl, cream butter until it is light in fluffy. Add in the salt, milk, vanilla and food coloring. Slowly add in the sifted powdered sugar and beat until well mixed and then frost your cookies and add sprinkles if desired.