Fresh, cool, and clean-cut. These Layered Mint Cookie Bars bring sharp layers, crisp edges, and a smooth chocolate finish to the dessert table. A buttery shortbread with cocoa base sets the foundation, the mint filling adds a soft creamy middle, and the ganache top seals it all with a rich chocolate cap. The result looks polished and tastes like a bakery-window classic with a St. Patrick’s Day lean.
These bars are best baked in a Fat Daddio’s POB-9132 pan for even baking and clean layering. Precision matters here. Press the shortbread base firmly into the prepared pan so it bakes into a solid, tidy foundation. Let that layer cool slightly before adding the mint filling. That pause keeps the layers distinct instead of softening into each other. After baking, give the bars time. The mint layer needs a full cool-down and a good chill so the final chocolate topping can sit cleanly on top and set with a smooth finish.
Ingredients for Layered Mint Cookie Bars
This recipe yields one 9 x 13 x 2 inch pan of bars.
For the shortbread base
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1 cup (226 grams) unsalted butter, softened
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3/4 cup (150 grams) granulated sugar
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2 teaspoons vanilla extract
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1 3/4 cups (210 grams) all-purpose flour
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1/4 cup (25 grams) unsweetened cocoa powder
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1/4 teaspoon salt
For the mint filling
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1/2 cup (113 grams) unsalted butter, softened
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2 cups (240 grams) powdered sugar
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2 tablespoons milk or heavy cream
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1 teaspoon peppermint extract
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2 to 3 drops green food coloring, optional
For the chocolate ganache topping
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1 cup (170 grams) semisweet chocolate chips or chopped semisweet chocolate
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1/2 cup (120 milliliters) heavy cream
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1 tablespoon unsalted butter
Step-by-Step Baking Instructions
Prepare the pan and oven
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Preheat your oven to 350° F (177° C).
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Grease and flour your Fat Daddio’s POB-9132 pan.
Make the shortbread base
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Cream the butter and sugar,
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Add vanilla, then mix in the flour, cocoa powder, and salt until a soft dough forms..
- Transfer the dough to the prepared pan and press it firmly and evenly across the bottom. Use clean hands or the bottom of a measuring cup to compact it well. This base should feel packed and level.
Bake the base
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Bake for 18 to 22 minutes, or until the edges are lightly golden and the center looks set.
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Remove from the oven and let the shortbread cool slightly in the pan. It should still be warm, but not hot, before the mint filling goes on. This helps keep the layers clean and distinct.
Make the mint filling
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In a medium bowl, beat the softened butter until smooth.
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Add the powdered sugar, milk or cream, and peppermint extract.
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Beat until creamy and spreadable.
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Add a few drops of green food coloring if using, and mix until the color is even.
Add the mint layer
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Spread the mint filling evenly over the slightly cooled shortbread base.
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Smooth the top with an offset spatula or the back of a spoon.
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Let the bars cool completely, then chill for several hours or overnight. This step matters. The mint layer needs time to firm up before the chocolate topping is added.
Make the ganache topping
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Place the chocolate and butter in a heat-safe bowl.
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Heat the heavy cream in a small saucepan until it is hot and just beginning to steam. Do not boil.
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Pour the hot cream over the chocolate and butter.
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Let it sit for 2 to 3 minutes, then stir until smooth and glossy.
Finish the bars
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Pour the ganache over the chilled mint layer.
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Spread gently into an even layer, covering edge to edge.
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Return the pan to the refrigerator for 30 to 60 minutes, or until the chocolate topping is set.
Slice and serve
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Once fully chilled and set, cut into squares or bars with a sharp knife.
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Wipe the blade clean between cuts for sharp, bakery-style edges.
These Layered Mint Cookie Bars bring cool mint, tender shortbread, and a smooth chocolate finish together in clean, bold layers. They slice beautifully, hold their shape, and look right at home on a spring dessert table.
Looking for more baking inspiration? Browse our collection fatdaddios.com/recipes.
