This can really vary, as bell peppers come in a wide range of sizes! Though if you are stuck without measuring tools and have to eyeball it, i'd say your average bell pepper, chopped up, is probably about a cup.
A food scale is realllllllly helpful. I always weigh my veggies (and most other foods too).
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 164.0