Heat your base. In a small pot, combine 1/2 cup rolled oats, 1/2 cup milk, and 1/2 cup water. Add a pinch of salt.
Bring to a gentle simmer over medium heat, stirring occasionally.
Add pumpkin and spice. Stir in 1/3 cup pumpkin purée, 1 teaspoon pumpkin pie spice, and 1/2 teaspoon vanilla extract. Keep it at a soft bubble and stir until the oats start to thicken, about 3–4 minutes.
Sweeten lightly. Add 1–2 teaspoons maple syrup or honey. Taste and adjust as needed.
Remember, protein powder may add sweetness too.
Reduce the heat. Turn the heat to low. This keeps the oatmeal creamy and prevents sticking or scorching on the bottom.
Mix in protein powder. Remove the pot from heat and whisk in 1 scoop (about 25–30 g) vanilla or unflavored protein powder. If it thickens too much, splash in extra milk until smooth and creamy.
Finish with yogurt (optional). Stir in 2–3 tablespoons plain Greek yogurt for a tangy, custard-like finish.
This also cools the oatmeal to a comfortable eating temperature.
Top and serve. Transfer to a bowl and add your favorite toppings: chopped pecans, pepitas, banana slices, a sprinkle of cinnamon, or a drizzle of nut butter. Serve warm.