Prepare the Potato Filling
Warm the oil in a two-to-three-quart pot. Chop the onion and sauté until lightly golden, about 15 minutes.
Pour the oat milk into the pot, season with salt, pepper, and garlic powder and bring to a simmer. Add in the mashed potato flakes and stir. Remove from heat and continue to stir until smooth.
Mix in mustard. Slowly pour in hot water until smooth and creamy. (You may not need all of the water).
Allow the mixture to cool. This can be made ahead of time and stored in the refrigerator.









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