This small oatmeal skillet cookie is soft, chewy, and packed with rich butterscotch flavor. Baked in a skillet for crisp edges and a warm center, it’s an easy dessert perfect for one or two people.
Preheat the oven to 350°F (177°C). Butter a 6.5-inch cast iron skillet or a 5x5-inch baking dish and set aside.
Mix the wet ingredients: In a bowl, stir together melted butter, granulated sugar, and brown sugar until smooth. Mix in the egg yolk and vanilla.
Combine the dry ingredients: In a separate bowl, mix the flour, oats, baking soda, and cinnamon.
Make the dough: Add the dry ingredients to the wet mixture and stir until combined. Fold in the butterscotch chips.
Bake the cookie: Press the dough into the prepared skillet and bake for 18-20 minutes, until the edges are lightly golden. The center may look slightly underdone but will firm up as it cools.
Cool and serve: Let the cookie cool in the skillet for at least 10 minutes before slicing.
Notes
Grease the Skillet: Butter or lightly spray the skillet or baking dish to prevent sticking and ensure easy removal.
Measure Flour Correctly: Spoon flour into the measuring cup and level it off with a knife to avoid using too much, which can make the cookie dense.
Don't Overbake: The edges should be lightly golden when you take it out. The center may look slightly underdone, but it will firm up as it cools.