Yes, green peppers, although I’m sure other colors would suffice.
And, yes, a glaze of ketchup, mustard and brown sugar....classic.
You pushed me into finding where oats are used in cosmetics. Here you go:
Let me know how they work for you.
I and many people I know, do NOT like meatloaf made that way; though I do know that others do. But...with oats too?
OTOH, ready made and home made breadcrumbs, with or without Italian herbs and can be used in meatloaf and meatballs, and rice is used in making some meatballs as well as in stuffed peppers and stuffed cabbage; hence my confusion.