Preheat oven to 325°. In food processor, combine flour, sugar, salt, and butter until combined. Place dough in bowl and knead until it comes together.
On waxed paper, roll dough into a ½”-thick square. Cut dough into ½-inch squares. Place dough onto large cookie sheet. Bake until cookies are light brown, 18 to 20 minutes. Let cool completely.
Divide vanilla frosting into 3 small bowls. Dye one bowl red with red food coloring and the other green. Sprinkles red and green sprinkles onto frosted cookies.
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