In a bowl, mix oats, protein powder, chia seeds, flaxseeds, and salt until evenly combined so the dry ingredients are well distributed.
Add milk, yogurt, honey, and vanilla extract, then stir thoroughly until the mixture becomes smooth and creamy.
Let the mixture sit briefly to allow seeds and oats to begin absorbing liquid for better consistency.
Transfer into jars or containers, seal tightly, and refrigerate overnight to develop flavor and texture.
Stir before serving and add fresh toppings for enhanced taste and texture.