Preheat oven to 325 degrees. Prepare cookie sheets with either silicon bake mats of parchment paper. If choosing to chill the dough a few hours up to overnight, wait until ready to bake before this step.
Melt the butter and let sit for 10 minutes to cool slightly. You can either melt the butter in a large glass bowl in the microwave or in a pan over the stove and then transfer to a separate bowl large enough to mix the rest of the cookie dough in.
Once the butter is cooled, add in the white and brown sugars and mix by hand until well-blended. Add the eggs and vanilla and mix well again.
In a large bowl, whisk the oats, flour, coffee grounds, cinnamon, nutmeg, baking soda and salt together and then add this to the butter mixture.
Fold in in the semi-sweet and cinnamon chips and mix either with a spoon or by hand. The dough will be stiff but still easy enough to mix by hand. You can chill the dough for a few hours up to overnight or bake immediately.
Using a cookie scoop or a spoon, scoop out heaping tablespoonfuls (closer to 2 tablespoons) and place 2” apart on a prepared cookie sheet.
Bake for 10-12 minutes Allow the cookies to cool on the baking sheet for about 10 minutes and then remove and cool completely on a wire rack.