Food for muscle gain

Good low fat carbs: potato, sweet potato, rice, squash, banana, quinoa

Good protein sources: cottage cheese, Greek yogurt, chicken, turkey, streak, bison, fish, shrimp, jerkey, ground meats, chick peas, lentils, black beans

Good protein shake: Tera's whey grass fed organic protein powder in dark chocolate flavor blended with coconut water for your mixing liquid- delicious and clean (this protein powder has minimal ingredients and is stevia sweetened so no added sugar, and using coconut water for a mixer adds natural sweetness and electrolytes). On the go I sometimes will do an organic valley chocolate protein shake (these come pre-mixed in individual serving bottles). This is more expensive and has sugar, but not bad once in a while and tastes great.

Not sure why you are needing 2-3 protein shakes a day?? 1 or 2 max should be sufficient... they are only meant to supplement your diet, not replace food.

Why don't you meal prep so you have lunches to bring and eat that you made and know their macros?

Too many carbs will put on body fat or prevent body fat loss just as much as excess fat in the diet will- its your total calorie intake you may want to adjust. If you aren't slimming down you aren't in a caloric deficit.

Also to build muscle you need to be in a caloric surplus.

It's kind of hard to slim your waist and gain muscle simultaneously unless you just eat at maintenance and do a whole lot of strength training- but this will take a while and if your macros aren't really dialed in you might not have success.

What are your stats and current calories and macros??

How much protein are you trying to eat? What are your stats? If your weight is close to goal, you may just need to recomp. How are your calories and macro %now?
Also, what is your lifting routine? Are you progressing?

Check that your macros are correct.
Look at your training regimen...you haven't mentioned what you are currently doing in the gym.
What are your stats? These will help you see where to start or where to go from here.
There have been a lot of good protein sources mentioned. I have 1-2 protein shakes per day, these have helped me hit my protein targets, the others are easier for me to reach. Maybe try to stick with a base flavour like vanilla, that way you can build on the flavour if you fancy a different taste one of the days. E.g. Adding cinnamon, nutmeg, fruits ( note the sugar) etc.
There are a lot of healthy yummy fats

1. Make sure your macros are correct. katyhearnfit.com offers a free macro calculator. This might sound crazy to you, but you're probably not eating enough.
2. Protein sources: chicken, lean turkey, eggs, egg whites, fat free Greek yogurt (mix half serving of protein, try PEScience Snickerdoodle flavor, the brand itself offers sample packets of their flavors if you check out their website), I personally also like NLA for her Chocolate Eclair protein. You can also have beans (measure these because a moderate serving can be high in carbs) or tofu! Carb sources: beans, rice (jasmine is a great white rice), sugar free cereal, english muffins, ezekiel bread, sweet potato, and fruit are all great sources that provide basically 0g fat. Fat sources: egg, avocado, nuts, nut butters.
3. Pack your lunches. Track and STICK TO your macros for 2 weeks. Then re-assess. Water consumption is also key- days that I drink my gallon or more I find myself 3-4 pounds lighter than days I don't. But again, set a plan and stick to it because consistency is KEY. Good luck!!