Preheat the oven to 350°F.
Place your cupcake wrappers in muffin baking tins.
Divide 3 egg yolks. Keep 1 egg white in a separate bowl.
Beat your egg white until stiff peaks.
In a separate bowl, beat the heavy cream until stiff peaks. Combine both the beaten egg whites and the heavy cream by carefully folding it together. Keep aside.
In a separate large bowl, beat your egg yolks with the monkfruit sweetener. Whisk until well combined, then add vanilla extract, almond flour, baking powder, lemon juice, lemon zest and salt. Combine well.
Fold the egg white and heavy cream mixture with the rest of your ingredients in small increments until all is nice and smooth.
Pour into your cupcake wrappers and bake for about 20 min or until the center is slightly firm. Let them cool completely before frosting.