Start by selecting a mason jar or airtight container with a lid. A jar works best because you can mix, store, and eat directly from it. This also makes cleanup much easier.
Pour the milk into the jar first. Then add vanilla extract and honey or your preferred sweetener. Stir the mixture slightly so the flavors blend well.
Add rolled oats and flaxseeds or chia seeds to the jar. Stir thoroughly so all the oats are coated in liquid. This step ensures the oats soften evenly overnight.
Add one scoop of protein powder to the mixture. Stir well until the powder dissolves completely. This helps create a smooth texture and boosts the protein level.
Add the chopped strawberries into the jar. You can mix them into the oats now or keep them as a topping for the next morning.
Close the jar with a lid and place it in the refrigerator. Let the oats soak for at least 6–8 hours so they absorb the liquid and soften properly.
In the morning, open the jar and give the oats a quick stir. If the mixture is too thick, add a splash of milk and mix again before serving.