Why spätzle turns gummy and how to fix it Why does spätzle turn gummy instead of tender? In this quick video, I explain the most common reasons this happens and what to change so the texture turns out right. Key Takeaway: For tender spätzle, keep the batter thick, beat just until bubbly, then let it rest. Cook in gently simmering water and lift it out soon after it floats. Common Mistake: Using batter that is too thin and leaving the spätzle in the water too long.