Spread 3 tablespoons softened butter on the bottom and halfway up the sides of the 13 x 9 baking dish. Set aside.
Melt the remaining butter in the microwave (or on the stovetop). Set aside.
Cream the softened butter and sifted confectioners' sugar together in a large bowl until creamy. Add the lightly beaten egg and vanilla. Blend to combine.
Sift the flour and salt into the butter and sugar mixture. Blend on slow to combine, scraping down the sides of the bowl with a spatula as needed.
Switch to a wooden spoon and stir in the chopped pecans along with the red and green cherries.
*Note - If your feel your dough is too dry and crumbly, stir in 1-2 tablespoons of cold water until the dry bits of dough are hydrated. (see video). This step is not called for in the original recipe, but adding additional moisture will make a much needed difference in the hydration of the dough.
Press the cookie dough evenly into the bottom of the buttered baking pan from corner to corner. *Note - this will take a bit of time. Be patient with the process.
Brush the melted butter evenly over the unbaked cookie dough.Bake in a preheated oven for 20-22 minutes or until the cookie is light golden brown in color. Remove to a cooling rack to cool completely.
Once cooled, cut the cookies evenly into bars using firm, downward pushes with a bench scraper.
Video
Notes
Store cherry slice cookie bars in even layers in an airtight container at room temperature for 7 days, or in the refrigerator for up to 14 days.Cookies may be frozen. Store in an even layer in an airtight freezer container and freeze for up to 4 months.Unbaked cookie dough may be frozen for up to 3 months if wrapped well in plastic wrap and stored in a zip top freezer bag. Thaw in the refrigerator overnight and continue with the recipe as written.