To prevent cornbread dressing (stuffing) from becoming gummy, it's crucial to strike the right balance between moisture and texture. One key tip is to ensure your cornbread and bread cubes are adequately dried or slightly stale before mixing them with other ingredients. Additionally, avoid overmixing the stuffing once you add liquid; gently combine the components to maintain a desirable texture. Lastly, don't add too much liquid at once; gradually incorporate it while monitoring the stuffing's consistency to prevent it from becoming overly moist and gummy.