Starting purees is great! After the liquid diet, it's nice to be able to eat something resembling real food. You should mix protein powder into purees to make sure you meet your protein goal. My advice for that is to use flavored protein powder for sweet foods and unflavored protein powder for savory foods. Here's what I ate in the pureed stage:
Fat-free, no sugar added Greek yogurt (vanilla yogurt + birthday cake protein powder; vanilla yogurt + chocolate protein powder + powdered peanut butter; strawberry yogurt + strawberry protein powder, etc.)
Fat-free, sugar-free pudding (chocolate pudding + chocolate protein powder + powdered peanut butter; vanilla pudding + strawberry protein powder, etc.)
Unsweetened applesauce + cinnamon roll protein powder
Protein oatmeal + cinnamon roll protein powder
Pureed refried beans + unflavored protein powder, topped with enchilada sauce + Laughing Cow cheese
Pureed black bean soup + unflavored protein powder
Mashed cauliflower + unflavored protein powder, topped with gravy