In a food processor, pulse 1 cup (100 grams) oats and 8 ounces dark or semi-sweet chocolate until finely ground.
Place butter and peanut butter in a large mixing bowl.
Beat with an electric mixer until smooth.
Add white and brown sugars.
Beat until light and fluffy.
Add eggs and vanilla and beat until incorporated.
In a large bowl whisk together flour, baking powder, baking soda, and salt.
Add to the mixing bowl and beat just until combined.
Add remaining ½ cup (50 grams) whole oats and the ground chocolate and oat mixture.
Stir just until combined.
Chill cookie dough, covered, at least 2 hours and up to 1 week. It is easier to form large, round balls using a 2 inch (5 centimeter) ice cream scoop before chilling.
Just before baking, arrange balls about 2 inches (5 centimeters) apart on ungreased baking sheets.
Bake cookies in batches in the middle of the oven for around 15 minutes, or until just pale golden.
Turn pans around half way through baking. Be sure to keep dough chilled while baking earlier batches.
Cool cookies on baking the sheet 5 minutes.
Transfer to racks to cool completely.
Dough and baked cookies may be frozen for several months.
Recipe by Crawfish and Caramel | Amy Eber at http://crawfishandcaramel.com/chocolate-peanut-butter-and-oat-cookies/