Flourless baked goods tend to stick to the pan more than muffins made with a traditional flour. If you are baking these for guests, I recommend using a parchment muffin cup (affiliate link) to ensure these muffins will easily release from the pan, and from the paper liner. If you prefer to use silicone muffin cups, be extra gentle when trying to get these muffins out, since they are more fragile than a grain-based muffin.