if you do lots of greens, add flax, add chia seeds, some low glycemic fruits like berries. I do 1/2 banana. I don't do dairy, so I don't add yougurt or milk.
My smoothies are extremely nutrient dense and top out at 300 or so calories. less if I use water instead of almond milk. I use about 4 or 5 servings of veggies from spinach, kale, collards, swiss chard, celery, carrots, broccoli. Fruits I use are banana (only 1/2), any kind of berry, pineapple, cherries, peaches, pears, apples, kiwi. Sometimes I will add 1/4 cup of nuts or seeds. Sometimes I add 1 tbs of nut butter. I add cinnamon, assorted extracts (depending on what I have on hand).
You don't really need a recipe for a smoothie. Sure there are tons out there, but be creative or be simple. use what you like. If you don't like the taste-- too earthy or too green-- add honey, maple syrup, stevia, or more fruit. I have added cayenne pepper as well. Add some ginger. You'd be surprised how that makes something taste.
Be adventurous. Have fun with it.
DON"T BUY THE SMOOTHIE MIXES IN THE STORES. Those are filled with sugar. they don't use organic fruit and they add hidden sugars in them. make your own.