Philly Cheesesteak Lasagna Roll Ups

lean ground beef

butter

small yellow onion, diced

small green bell pepper, diced

ketchup

 tablespoon Worcestershire sauce

Kosher salt

fresh ground black pepper

cheddar cheese, shredded and divided

lasagna noodles, cooked one minute shy of instructions

tablespoon cornstarch

milk (I used whole)

 cup beef broth