Whip the SMBC: Ensure your SMBC is smooth and creamy. If refrigerated, let it come to room temperature and rewhip until smooth.
Add the Milk Powder Gradually: For every 500 grams (about 2 cups) of SMBC, start with 1–2 tablespoons of milk powder. Sprinkle it in while whipping the frosting on low speed.
Adjust Consistency: If the frosting becomes too thick, add a teaspoon of whole milk or cream to loosen it. Whip on medium speed to ensure the milk powder dissolves fully and integrates seamlessly.
Taste and Adjust: Once incorporated, taste the frosting. You can add more milk powder or a pinch of salt to enhance the flavor further.