Preheat your oven to 350°F (175°C) to ensure your cookie bakes evenly and comes out perfectly golden.
Grease your oven-safe skillet with a little butter or cooking spray to prevent sticking.
In a mixing bowl, whisk together the all-purpose flour, baking soda, and salt until well combined. Set aside.
In another bowl, mix the melted butter, melted peanut butter, brown sugar, granulated sugar, and vanilla extract until smooth. Then, add the lightly beaten egg and egg yolk, mixing until fully incorporated.
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix; a few lumps are okay!
Pour the cookie dough into the prepared skillet, spreading it evenly with a spatula.
Bake in the preheated oven for 20-25 minutes or until the edges are golden brown and the center is set but still soft.
Allow the skillet cookie to cool for about 10 minutes. This step is crucial as it helps the cookie firm up a bit, making it easier to scoop.
Scoop generous portions of vanilla ice cream on top of the warm cookie, drizzle with chocolate syrup or hot fudge, and top with toasted coconut, sprinkles, and cherries for an extra touch of fun!
