Drain your sweet potato puree thoroughly or use canned puree to prevent excess moisture, which can result in dense, sunken muffins instead of light and fluffy ones.

Fold the wet ingredients into the dry ingredients just until combined—overmixing develops gluten and creates tough, dense muffins with tunnels rather than an even, tender crumb.

Lightly toast the old-fashioned oats in a dry pan for 2-3 minutes before adding them to intensify their nutty flavor and add depth to complement the sweet potato.

Bring eggs and milk to room temperature before mixing to ensure proper emulsification and more uniform batter distribution, resulting in consistently moist muffins.

Let mini muffins cool in the pan for only 5 minutes before transferring to a wire rack—this prevents them from becoming too moist from steam, keeping them tender but not soggy.