PREP THE OATS: In a small bowl, mason jar, or plastic container, stir together the peanut butter, vanilla extract, Greek yogurt, milk, old-fashioned oats, maple syrup, salt, and cinnamon.
STIR: Stir well until all ingredients are fully incorporated. Taste the mixture and add any additional sweetener if desired.
CHILL: Cover and refrigerate overnight or until sufficiently cooled and thickened. (Sometimes I'll even make them in the morning, get ready, and then go eat them -- they are great even after just 30 minutes in the fridge)
OPTIONALLY TOP: Once ready to enjoy, top oats with a drizzle of peanut butter, some miniature chocolate chips, and some mini peanut butter cookies (see next step) if desired.
COOKIES: For the "cookies" add the honey, peanut butter, oats, oat flour (measure the oat flour AFTER blending the oats in a blender or food processor), and miniature chocolate chips to a small bowl. Mix (kneading with your hands as needed) until a thick and cohesive dough forms. If too wet, add a bit more oat flour and too dry, add a bit more honey or peanut butter. Form small balls by squishing the mixture and then rolling into balls. You need to squish it tightly and roll the balls tightly to keep them together. Add a few on top of the overnight oats if desired.