Chocolate Orange Tiger Cookies

Name: Chocolate Orange Tiger Cookies
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: European
Ingredients: 3 cups all purpose flour; 1/2 tsp baking soda; 1 tsp salt; 1 cup butter (softened); 1 cup granulated sugar; 1 cup brown sugar (packed); 1 large egg; 1 tsp vanilla; 1/4 cup cocoa powder (see notes below); 1 tbsp milk; 2 tbsp orange zest (about 1 orange); 4 drops yellow food coloring (see notes below); 2 drops red food coloring (see notes below); 1/4 cup flour (as needed, when the dough sticks)