Preheat the oven to 350 degrees Fahrenheit and line a large sheet pan with parchment paper.

Mix the applesauce, creamy peanut butter, and egg together in a medium sized bowl using a hand mixer or stand mixer.

Divide the mixture as evenly as possible into three medium sized mixing bowls (a little more than 0.33 cup per bowl).

Add all-natural red food coloring to one bowl, and all-natural green food coloring to another bowl, optional. Leave the last bowl uncolored.

Mix the food coloring into each wet mixture until completely combined. Keep in mind that the color will dilute when the flour mixture is added, so add a little more food coloring than you think it will need.

In a large bowl, combine the all-purpose flour and rolled oats and stir until well mixed.

Divide the flour mixture into three (1 cup each) and add to each of the three bowls.

Use a hand or stand mixer to stir the flour into each wet mixture until just combined.

The mixture should create a slightly dry but malleable dough. If it is too dry, add more applesauce, 0.5 Tablespoon at a time. If it is too wet, add more flour, 1 teaspoon at a time. Mix these add-ins with your hands if possible in order to avoid overmixing the flour.

Roll the three different colored doughs (or single colored dough) onto a lightly floured surface using a rolling pin until the dough is 0.25 inch in thickness.

Use Christmas shaped cookie cutters to cut out cookie shapes--rerolling the dough until all the dough is used. Place the cookies on the sheet pan.

Bake in the oven for 13-18 minutes or until they turn golden brown. You can vary the bake times depending on preference. For a softer treat, cook for less time.

Let cool completely before serving as treats to your precious canines.