Preheat your oven to 350. Put the meat into the stand mixer and begin mixing. Let it continue to mix as you chop the vegetables and add other ingredients. This is crucial. The mixer will begin to break down the meat and combine it very very well.
As the meat mixes, chop the bell peppers and onion and add them to the meat in the mixer. If you want some ideas of what to do with the extra bell pepper and onion search my site for the southwest beef and quinoa stuffed poblano peppers.
Use an immersion blender, a regular blender, a food processor (whisking the eggs until they are fluffy would work too) to mix the 4 eggs. Add to the meat mixture as it continues to mix.
Add the 1/2 cup bread crumbs and 1/2 cup crumbled saltine crackers.
Add the ketchup, the A1 sauce, and the Worcestershire Sauce.
Add the salt and pepper. (Don't be shy on either here!!)
Stop mixing and remove bowl. Using your hands, mix the meat mixture around, removing the meat from the paddle and scraping down the sides of the bowl.
Prepare a 9x13 baking dish/pan by spraying or rubbing with cooking oil. You can choose to divide the meat mixture in two - freezing one either before or after baking works well. The meatloaf shrinks down quite a bit - so if you have a large family, making one giant loaf would be best.
Take the meat out of the mixer bowl and form your loaves. Good luck. It's a lot of meat. Just dump it into the pan and then start forming it. The meat gods are with you. You've got this.
I do not cover with foil. Leaving it uncovered makes for a bit drier meatloaf, which is what we are going for here since we're using the 85/15 or 80/20 fat blend. It also helps the top to get nice and carmelized. Put your meatloaf into an oven heated to 350F. Bake for one hour. Get excited. It's gonna be soooo goooooood.
After one hour, remove and use a baster or a sauce brush and baste the meatloaf with some of the juices in the bottom of the pan. Remove a few tablespoons of the juice for the glaze and set aside.
Put the meatloaf back into the oven for 30 minutes.