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1
Preheat oven to 350 degrees F. Grease a 10x15-inch jelly roll pan and line with parchment paper.
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2
In a medium bowl, whisk together flour, cocoa powder, baking powder, and salt. In a large bowl, vigorously whisk together eggs, sugar, and stevia, until mixture is thickened and light yellow. Whisk in butter and vanilla. Fold in dry ingredients just until combined.
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3
Scrape batter into prepared pan and spread evenly. Bake until cake is set, 10 to 13 minutes. Do not overbake or the cake will dry out.
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4
Run a thin knife along the pan edge to release cake from pan. Place a piece of parchment paper on a countertop and invert cake onto parchment. While cake is still hot, roll up cake tightly in parchment, starting at a short end. Let cake roll cool completely, at least 20 minutes.
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5
Place heavy cream, creme fraiche, stevia, and peppermint extract in the bowl of a stand mixer fitted with a whisk attachment. Beat on medium speed until stiff.
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6
Unroll cake and cover evenly with peppermint cream, leaving a 3/4-inch border all around. Re-roll cake tightly, but not so tightly that filling oozes out. Wrap in plastic wrap and refrigerate at least 1 hour before serving.
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7
Right before serving, dust cake with cocoa powder and sprinkle with peppermint candies.
