Ingredients
Equipment
Method
- Preheat your oven to 325 degrees Fahrenheit. This is crucial for achieving that perfect bake. While the oven heats up, grab your 9-inch cast iron skillet and give it a quick spray with cooking spray to prevent sticking.
- Using an electric mixer, beat butter and brown sugar together until the mixture is fluffy and light. This step is important, as it incorporates air into the batter, making your cookie softer.
- Add in the egg and egg yolk, along with the vanilla extract. Beat until well combined. This mixture should be smooth and creamy, with a lovely aroma from the vanilla.
- In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add this dry mixture to the mixing bowl, beating just until everything is mixed in. Avoid over-mixing to keep your cookie soft.
- Now, fold in 3/4 cup of oats and 1/3 cup of chocolate chips using a spatula. You'll notice the dough becoming thicker and more substantial.
- Spread half of the cookie dough evenly in the bottom of your prepared skillet. Use your fingers or a rubber spatula to ensure it's evenly distributed.
- Next, smear the creamy peanut butter over the cookie dough layer. This creates a deliciously gooey center, and you can use as much or as little as you prefer.
- Scatter the remaining cookie dough over the top of the peanut butter, ensuring it covers as much surface area as possible. This will create a nice cookie top.
- Finally, sprinkle the remaining oats and chocolate chips on top for added texture. It’ll look beautiful and inviting!
- Place the skillet in the preheated oven and bake for 45 minutes. Keep an eye on it towards the end; if it starts to brown too much, cover it with aluminum foil. Once baked, let it cool slightly before slicing.
Notes
To store leftovers, keep the skillet covered with foil or plastic wrap at room temperature for up to three days.
You can freeze individual slices of the cookie. Just wrap them tightly in plastic wrap and place them in a freezer-safe bag for up to two months.
This cookie pairs wonderfully with a glass of milk or a scoop of vanilla ice cream.
For the ultimate indulgence, reheat single slices in the microwave for about 10 seconds before serving.
Try adding chopped nuts, dried fruits, or even a sprinkle of cinnamon for extra flavor!