If your buttercream separates, gently warm the exterior of the mixing bowl to soften the butter slightly and help restore its ...

Be careful not to overmix it, which can lead to dense, dry cupcakes. Alternatively, you can use just a hand whisk or rubber spatula here. Combine the vinegar and baking soda in a small bowl.

Mix again, then pause to push the mixture down into the bowl using a rubber spatula ... Cheesecake mixtures to be about 50/50. Place the cupcakes in a preheated 325°F oven for 25–28 minutes ...