Sounds like a good recipe. I make mine as my Mom did with uncooked oatmeal instead of bread crumbs. The best meatloaf is made with ground beef, pork and VEAL, but alas, veal costs as much as a car payment these days. Also, some grated carrot adds a little color and Vitamin A.
I also add carrots & celery, along with the onions & peppers like the above recipe.
However, I dice all of the veggies and cook until soft in about 2-3 TBS of butter. Then, I add the butter/veggie mixture, slightly cooled, into the rest of the meatloaf mixture.
Trust me...it is REALLY good that way...but then what isn’t with extra butter...LOL!