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Line an 8" square pan with a piece of parchment long enough to make a parchment sling. If you don’t have parchment, leave the pan unlined and ungreased.
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To make the almond butter layer: In a large bowl, combine the baking sugar alternative and butter. The sugar alternative won’t dissolve or fully combine with the butter, and the mixture will not be smooth; that’s OK.
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Add the almond butter, vanilla, and salt. Mix until combined.
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Add the graham cracker crumbs and mix until smooth.
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Transfer the mixture to the pan and press it into an even layer covering the bottom. Set aside.
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To make the chocolate layer: Set up a double boiler by filling a small saucepan with about 1" to 2" of water. In a separate bowl, combine the cream and sugar-free chocolate chips. Bring the water to a boil and then turn it down to the lowest heat setting and place the bowl of chocolate and cream on top of the saucepan; the water shouldn't touch the bottom of the bowl with the chocolate and cream to ensure a slow, even melting process.
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Use a flexible spatula to constantly stir the chocolate and cream mixture while it slowly melts over low heat. Remove from the heat when there are still some chips visible; it will continue to melt off the heat. Stir occasionally while the mixture cools until it becomes smooth and completely melted.
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Pour the chocolate over the almond butter layer, spreading it with the back of a spoon or an offset spatula to make a smooth, even layer; you can shimmy the pan back and forth gently to smooth it out as well.
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To add the topping: Place the almond butter in a piping bag and immediately pipe it on top of the melted chocolate layer in the design of your choice.
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Let the almond butter bars rest at room temperature until the chocolate has set but is not firm, an hour or up to several hours depending on how cool or warm your kitchen is. Resist the temptation to put the bars in the refrigerator; this will over-harden the chocolate and make it difficult to cut cleanly.
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Once the chocolate has set, remove the bars from the pan. Cut the bars into 36 squares; a table knife or bench knife works well here (a hot knife will keep things very clean). Let the bars rest, uncovered, for several hours (overnight is best), until the chocolate is firm.
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Storage information: Store leftover almond butter bars, well wrapped, at room temperature for several days; in the refrigerator for up to a week; or in the freezer for a month or more.