In a mason jar or container, combine the old-fashioned oats, plant-based milk, nut butter, maple syrup, chia seeds, cinnamon, and kosher salt. Stir everything together thoroughly, breaking up any clumps of nut butter so it distributes evenly throughout the mixture. I like to use a fork or small whisk to ensure the nut butter is fully incorporated and there are no dry oat pockets—this creates a more cohesive texture as everything sits overnight. Make sure all ingredients are well combined before covering.

Cover the jar with a lid or plastic wrap and place it in the refrigerator for at least 2-3 hours, though overnight (8 hours or more) is ideal. During this time, the oats absorb the milk and soften, the chia seeds hydrate and create a gel-like texture, and all the flavors meld together. I find that overnight oats actually taste better after a full night in the fridge because the flavors have time to fully develop and the texture becomes creamier.

Remove the jar from the refrigerator and give the oats a good stir, adding a splash more plant-based milk if the consistency is too thick for your preference. Transfer to a bowl if desired, or eat directly from the jar. Top with your choice of fresh fruit, granola, additional nut butter, coconut flakes, or any other toppings you enjoy, then serve immediately.