Preheat oven to 350 F and spray a 10-inch overproof skillet with cooking spray; set aside.: As you begin, breathe in the faint, clean scent of a properly preheated oven warming the room, it primes the pan so the edges set quickly and develop that coveted crisp ring. Using a well seasoned or ovenproof skillet helps transfer heat evenly, ensuring the bottom browns without burning. A common error is placing a cold pan in a hot oven, which can cause uneven baking, so make sure your skillet is ready and the oven is fully up to 350 F before you start; if the oven underperforms, your edges may stay pale while the center cooks through.
To a medium bowl, add the cookie mix, butter, egg, and stir until a soft dough forms.: You will notice the dough change from powdery to lumpy then smooth, with a soft, tacky texture that holds shape when pressed. The aroma becomes buttery and faintly sweet as the butter and egg bind the mix. Mixing thoroughly ensures even hydration so no dry pockets remain, which affects both texture and flavor. If you overmix, the dough can become dense, so stop as soon as it is homogeneous. If the mixture seems too dry, a small splash of milk helps, but follow the pouch directions closely to avoid a runny batter.
Spread dough evenly in skillet, smoothing with a spatula or pressing with fingertips to flatten and cover bottom.: As you work the dough into the skillet , feel for an even thickness across the pan, fingertip dimples will smooth out as the surface becomes taut and glossy. Even spreading guarantees consistent baking, so that edges crisp at the same rate as the center softens. A common mistake is leaving the center thicker than the edges, which leads to an underbaked middle; use a spatula to level and check visually for uniform coverage.
Evenly sprinkle with the chocolate chips, pressing them down lightly with your fingertips.: When you scatter the chocolate chips , watch them sink slightly as you press, creating molten pockets during baking that glisten once warmed. This pressing helps the chips adhere so they do not simply bake on top and fall off when you slice. Uneven distribution can leave bites without chocolate, so take a moment to space them evenly; if you add too many at once, the cookie surface may not brown evenly, so balance quantity for melt and structure.
Bake about 20 to 23 minutes or until edges are light golden brown. Do not overbake; cookie will continue to cook once out of oven due to carryover cooking and is meant to be gooey. If you prefer more well-done cookies, bake a few minutes longer.: The oven will sing a low hum, and you should see the edges transform to a warm, light golden color while the center remains slightly glossy and jiggly. This visual cue is key because the residual heat will finish the center as it rests, preserving gooeyness. A common pitfall is leaving it in too long which results in a uniformly firm cookie; if you like more structure, add small increments of time and watch closely to avoid dryness.
Place skillet on top of a cooling rack and allow to cool for about 5 minutes before drizzling with hot fudge and optionally serving with ice cream. Cookie is best warm and fresh but will keep airtight for up to 4 days. I wrap leftovers in plastic wrap in individually-portioned pieces and heat for 5 to 10 seconds in the microwave before serving for that just-baked taste.: As the skillet rests, the smell deepens into a caramelized sweetness and the edges set while the center relaxes into a luscious, spoonable texture; this waiting period is your reward. Drizzling warm hot fudge will create a glossy top that melds into the cookie's surface, and adding a scoop of cold ice cream creates an irresistible warm cold contrast. Avoid slicing immediately from a piping hot skillet, as the center may collapse and be overly runny; waiting the suggested minutes preserves structure while keeping the interior soft.
Adapted from Betty Crocker: The recipe's roots explain its reliability and consistent behavior across kitchens, which is why I trust the mix for dependable results. This source also means measurements and techniques are optimized for home cooks, offering a helpful safety net if you are new to skillet desserts. If you deviate from the pouch instructions, you might alter texture or bake time, so treat adaptations as experiments and note outcomes for future tweaks.