Mascarpone cheese is similar so it might work too. Overall, this is a terrific low carb chocolate buttercream frosting for any cake. It could easily pass as a real sugar frosting. It’s a moist low carb gluten free chocolate cake made with coconut flour.
Fill a saucepan with 1 inch of water. Bring to a simmer over medium-low heat. In a clean bowl combine egg whites and Splenda Granulated Sweetener. Place bowl over simmering water and whisk mixture constantly for 5 minutes, or until Splenda Granulated Sweetener is completely dissolved.
To get authentic buttercream frosting, you really need to use a bulk low-carb sweetener in powdered form. I like to use either Swerve Confectioners or Sukrin Melis. I've also used a regular granular sweetener like Lakanto in the past with good results. For this recipe, I used unsweetened cocoa powder.
Milk, Cream, Whipping Cream, or similar dairy- 1 tablespoon (can use up to 2 tablspoons if you want a more fluid frosting to work with). The more 'fat' the better your frosting will turn out. Vanilla Extract - 2 teaspoons. For best results, I recommend using standing mixer if you have one. Also, fit the mixer with a whisk attachment.