Beans are really hard to beat

But if you simply want to add fiber there is all kinds of powders available at the drug store eg. Benefiber or Metamucil (and dozens of others)

1 teaspoon of (most of them) contains 3 grams of fiber and can be stirred into anything you drink

Your Doctor/Nutritionist/Dietitian can advise how much fiber (You) should get everyday

My personal guidance is 38 grams per day (male with Type 2 Diabetes) the recommended daily allowance for normal/non-diabetic is 25-30 grams/day depending on age and gender

The average person only consumes about 15 grams per day (statistical average) and it's pretty tough to get the RDA without taking a supplement - you just can't eat enough naturally under normal eating patterns

For example a Bowl of Bran Flakes advertised as "really high in fiber" contains barely 5 grams - I guess you could eat 7 bowls/day 😁

I eat a lot of wonderful salads. If you add Mrs. Dash and a good basalmic vinegrette they can be amazing, I also snack on non starchy veggies: mini-bell peppers, broccoli florets, baby carrots, etc.