KETO French Macaroons with White Velvet Buttercream

Name: KETO French Macaroons with White Velvet Buttercream
Cuisine: Mediterranean, European, French
Ingredients: 1 Cup of Almond Flour; 1/2 Tsp Pink Himalayan Salt, divided in 2; 1+3/4 Cup Powdered Erythritol; another 1/4 Cup of Powdered Erythritol; 1 Tbsp Baking Powder; 1/2 Tsp Vanilla Extract; 3 Egg Whites room temperature; 2 drops purple gel food colouring (optional); 1 Cup Powdered Erythritol; 1 Tsp Vanilla Extract; 1/2 Cup Butter; 1/4 Cup Heavy Whipping Cream (for the velvety fluffiness); Nutrition Per Serving; 1 serving = 1 buttercream filled cookie; Protein 1.2g; Total overall Sugar Alcohols 27g; Net carbs per serving 0.5g; aka 1 carb per 2 cookies