High Protein Overnight Oats

Method

1. 1

   Whisk the dry base. Combine the rolled oats, potato protein isolate, chia seeds, and salt in a bowl and whisk for about 20 seconds before any liquid goes in. Potato protein isolate is a fine powder, so whisking it through the oats first stops it from clumping into damp pockets later. Chia seeds need to be evenly distributed too, since they will gel and thicken the whole mixture as it sits. A dry whisk is faster and far more effective than trying to break up lumps once the milk is added.

2. 2

   Add liquid and stir. Pour in the milk, maple syrup, and vanilla, then stir thoroughly until no dry powder remains at the bottom of the bowl. Potato protein isolate hydrates quickly, so the mixture will start to thicken within a minute — keep stirring until it looks uniform. Any milk works here: dairy gives the highest protein, while a thicker oat or soy milk holds the spoonable texture well. Scrape the sides of the bowl to catch stray powder, because un-hydrated isolate tastes dry on the tongue.

3. 3

   Divide and rest overnight. Split the mixture between two jars or containers with lids and refrigerate for at least 6 hours, ideally overnight. During this time the oats soften, the chia seeds swell, and the potato protein fully hydrates into the liquid — this is what gives the finished oats their thick, pudding-like body without any cooking. The mixture will firm up considerably, so if you prefer a looser texture, stir in a splash of milk before eating. Overnight oats keep in the fridge for 3 to 4 days, so this is worth making in batches.

4. 4

   Make the chocolate variation. For a chocolate version, whisk the 2 tablespoons of unsweetened cocoa powder into the dry base in step one, alongside the oats and protein. Cocoa is naturally bitter, so taste before serving and add a little more maple syrup if needed. Use cocoa powder you add yourself rather than a pre-flavored chocolate protein powder — the Clean Label Project's 2025 Protein Study 2.0 found chocolate-flavored powders contained 110 times more cadmium than vanilla varieties, with 65% of chocolate protein powders exceeding California Prop 65 levels. Adding your own cocoa keeps the ingredient list short and the source known.

5. 5

   Make the berry variation. For the berry version, stir the cup of frozen mixed berries into the base before refrigerating. As they thaw overnight they release their juice, coloring the oats and adding tartness that balances the maple syrup — no extra sweetener needed. Frozen berries work better than fresh here because the freeze-thaw breaks down the cell walls and lets more juice seep into the oats. To warm any version the next morning, microwave it for 60 to 90 seconds, stirring halfway; heating cold-set oats does not reduce their protein content.