In a medium bowl or jar, add 1/2 cup rolled oats, 1 tablespoon cocoa powder, and 1 scoop protein powder. Stir to combine so there are no cocoa clumps.
Add 2/3 cup milk, 1/4 cup Greek yogurt, 1–2 teaspoons maple syrup, 1 teaspoon vanilla, a pinch of salt, 1–2 teaspoons orange zest, and 2–3 tablespoons fresh orange juice.
If using, stir in 1 tablespoon chia seeds or 2 teaspoons ground flaxseed for extra thickness and fiber.
Whisk or stir until smooth. The mixture should look slightly loose; the oats and seeds will thicken it overnight.
Cover and chill for at least 4 hours, ideally overnight.
In the morning, stir well.
If it’s too thick, add a splash of milk to loosen. Taste and adjust sweetness or zest.
Top with orange segments, dark chocolate shavings, cacao nibs, or toasted nuts. Enjoy cold.