Step 1 of 9
Peanut Butter Skillet Cookie
Preheat the oven to 350°F.
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Step 2 of 9
Peanut Butter Skillet Cookie
Spray an 8-inch cast-iron skillet with nonstick cooking spray.
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Step 3 of 9
Peanut Butter Skillet Cookie
Place the softened butter, peanut butter, brown sugar, granulated sugar, honey, and vanilla extract in a large bowl. Use a mixer to cream together on medium speed until pale and fluffy, about 1 minute. Add the egg and continue to beat on medium speed until light and fluffy, 30 seconds to one minute.
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Step 4 of 9
Peanut Butter Skillet Cookie
Add the flour and baking soda to the bowl. Beat the mixture on medium speed until all ingredients are combined, about 1 minute. Scrape down the sides of the bowl with a rubber spatula as needed.
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Step 5 of 9
Peanut Butter Skillet Cookie
Fold the chocolate chips or peanut butter cups into the cookie dough until they are evenly distributed.
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Step 6 of 9
Peanut Butter Skillet Cookie
Transfer the cookie dough to the prepared cast-iron skillet. Use a spoon or clean hands to press the dough into an even layer.
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Step 7 of 9
Peanut Butter Skillet Cookie
Bake the cookie on middle rack of oven until golden brown at the edges and a toothpick inserted in the center comes out clean, 28-30 minutes.
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Step 8 of 9
Peanut Butter Skillet Cookie
Check to see that cookie is done. Remove from oven or add time as needed.
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Step 9 of 9
Peanut Butter Skillet Cookie
Allow the cookie to cool for 10 minutes before serving. Serve the cookie warm directly from the skillet. Alternately, the cookie may be cooled to room temperature in the skillet, then cut into slices.