In a large bowl, cream together butter, brown sugar, white sugar, and peanut butter until smooth. A stand mixer or electric hand mixer works well.
Beat in the eggs until well blended. Combine the flour, baking soda, and salt; stir into the creamed mixture.
Mix in the oats until just combined.
Scoop cookies, using a medium cookie scoop, on cookie sheets lined with parchment paper.
Bake for 10 minutes.
Allow cookies to cool for 5-6 minutes before transferring them to a cooling rack.
Add a small spoonful (about a teaspoon) of peanut butter to the top of each warm cookie. Allow peanut butter to stand on cookies for a few minutes then spread over the cookie with a butter knife.
Microwave glaze (ganache) ingredients in a microwave-safe bowl in 20-second increments (for about a minute). Stir until completely smooth. Spoon ganache over cookies.
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Notes
Want to really take these up a notch? Add a handful of chopped peanuts to the cookie dough!
You can use quick oats and old-fashioned oats interchangeably in cookie recipes.
You can use unsalted butter if you’d like, but I use salted butter in all of my recipes.
These cookies can be enjoyed at room temperature or chilled. Lightly cover the cookie sheet with plastic wrap. They will stay fresh for up to 3 days.