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Preheat oven to 350°F.
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Cake Directions:
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In a medium bowl, whisk eggs together with an electric mixer for about 2 minutes, until lemon yellow, then mix in sweeteners.
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Blend in sour cream and softened butter.
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In a separate bowl, mix together all dry ingredients.
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Add the dry ingredients to the wet ingredients and mix until fully incorporated.
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Add in apple cider vinegar and vanilla to batter, mix together.
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Equally separate batter into 4 or 5 bowls. Add a different color of food coloring to each bowl and mix well.
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Add each colored batter to a piping bag or a sandwich bag.
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Line a cookie sheet with parchment paper, spray with cooking spray.
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Pipe each color in diagonal lines across the parchment lined cookie sheet until each colored batter is used up.
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Tap the cookie sheet on the counter a couple of times to eliminate any bubbles and to even the batter out. Put it on the middle rack of the oven.
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Bake for 10-15 minutes. It will spring back a bit when touched and a toothpick comes out clean when inserted into the center of the cake.
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When the cake is done, let cool for 5 – 10 minutes. After it has cooled, roll the cake with the parchment paper, starting from the short end. Try to make sure that the roll is tight as you are rolling.
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Leave on the counter to cool completely, at least 1 hour. Make the filling as the cake cools.
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Filling Directions:
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Place softened butter and cream cheese in a medium bowl.
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Beat butter and cream cheese together until smooth.
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In another bowl, add heavy cream and beat until whipped cream.
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Add the whipped cream to the butter and cream cheese mixture.
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Add powdered erythritol and beat all together until smooth.
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To Assemble:
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After the cake has cooled and the filling is made, unroll the cake gently so that it does not crack.
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When completely unrolled, spread the filling over the whole cake, leaving a bit of space at the end without filling.
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Roll the cake back up without the parchment paper. Make sure you keep it tight, but not too tight because the filling will spill out.
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Wrap it in plastic wrap.
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Place in the refrigerator for a couple of hours to overnight to set.
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Store in refrigerator.