Carbs post workout are almost impossible to turn into body fat because your glycogen levels are depleted and your muscle insulin sensitivity is at it's highest. You should AWLAYS have carbs in your post workout meal.
I LOVE to make protein and oatmeal (nicknamed pro-oats). Make your oatmeal and let it sit for a couple minutes to thicken up. Then stir in the oatmeal. It tastes exactly like those instant oatmeal packets you used to eat as a kid that are full of sugar.