Special equipment: 1 large piping bag; a medium grass (multi-opening) piping tip; a small kitchen blowtorch
For the skillet cookie: Position an oven rack in the center of the oven and preheat to 350 degrees F. Grease the bottom and sides of a 10-inch cast-iron skillet with about 1 tablespoon of the butter.
Whisk together the flour, baking powder and salt in a medium bowl. Beat the sugar and remaining butter in a large bowl with an electric mixer on medium-high speed until light and fluffy, about 4 minutes. Add the vanilla and egg, beating to incorporate. Add the flour mixture in 2 additions, beating on medium-low speed until incorporated.
Use a rubber spatula to scrape the dough into the prepared skillet, gently spreading it to the edges and smoothing the top. Bake until the edges are brown and the top is golden but still slightly soft, 40 to 45 minutes. Cool on a wire rack 15 minutes.
For the decorations: Lower the oven temperature to 300 degrees F. Line a baking sheet with aluminum foil.
Sprinkle the crushed red and pink candies on the baking sheet in a single layer but touching. Bake until melted, 5 to 7 minutes. Cool on the baking sheet, then break into large shards for the candy fire.
Meanwhile, remove one-quarter of the frosting to a small bowl and combine with the green food coloring. Transfer to a piping bag fitted with a medium grass tip. Spread the remaining frosting in the center of the cookie, leaving a 1 1/2-inch border around the edge. Sprinkle the crushed chocolate cookies over the frosting, covering all of the white. Pipe the green grass frosting to fill in the border.
Pile the pirouette cookie pieces in the center to form kindling. Top with some of the smaller or crushed shards of melted candy.
Form a firewood teepee with the candy bars. Arrange tall shards of the melted candy fire sticking out of the gaps.
Attach a marshmallow to each pretzel rod. Lay the pretzel skewers across the candy fire pit and gently toast the marshmallows with a small kitchen blowtorch. Slice and serve with all the gooey, melted toppings.
When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
Propane gas torches are highly flammable and should be kept away from heat, open flame and prolonged exposure to sunlight. They should be used only in well-ventilated areas. Follow torch manufacturer's instructions for use.
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