Preheat oven to 350°F. Line your cookie sheets with parchment paper.
In a mixing bowl, stir together the flour, cocoa powder, baking powder, baking soda, salt, and cinnamon.
In your mixer, cream together the butter, white sugar, and brown sugar until well-combined and slightly fluffy.
Beat the egg and vanilla into the butter and sugar mixture.
Stir in the dry ingredients and mix well.
Mix in the oats, chocolate chunks, and cherries, to make your cookie dough.
Using a spoon or cookie scoop, divide the dough into tablespoon-sized balls, placed roughly two inches apart on your baking sheet. Keep in mind that they will spread out as they bake.
Bake for about 9 minutes.
Remove from oven and let cool for about five minutes. Then, move them to a cooling rack to continue cooling (and sneak one or two to eat immediately; they're delicious warm.)