Why Your Homemade Oat Milk Is Slimy And How To Prevent It - Tasting Table
Briefly

Using ice-cold water during preparation is vital to making homemade oat milk free of a slimy texture, as heat activates oats to release excess starch.
To ensure a successful batch of oat milk, start with rolled oats instead of instant ones, and blend just long enough to achieve desired creaminess.
Read at Tasting Table
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