Here's a quick way to remove the stem, ribs, and seeds from bell peppers without making a mess.
1 Using a sharp knife, cut a thin slice from bottom of pepper so it sits flat on the cutting board as you work.
2 Working from top to bottom and following shape of pepper, slice off outer part in strips, and discard the rest. If any white part remains on strips, shave it off with the knife.
3 Slice or chop peppers as desired or as instructed in a recipe.