Homemade mass gainer shakes

I want to make a homemade shake for bulking because commercial mass gainers are quite expensive. Can you guys suggest some simple ingredients that work well together

Banana milk and oats is my regular combination

Add some peanut butter for extra calories

You can also include curd for a thicker texture

I sometimes add dates to my shake

Bro homemade shakes are much easier on my budget

Dont forget to count the calories from the shake

You can add protein powder if you already use it

Keep the ingredients simple and enjoy your food