Preheat oven to 350°F.
Assuming all veggies are sliced, diced and chopped, you want to finely chop the mushrooms. You can do this with a knife or a food processor. A cheese grater works really nicely, too.
Once the mushrooms have been chopped, sauté with half of the olive oil and a little salt and pepper. Sauté until the water cooks out is removed and you're left with a paste-like consistency.
In a separate pan, soften on low heat the onions and garlic with a little salt, pepper and the remaining olive oil. Sweat until translucent.
Set both veggies and mushrooms in the cooler to chill.
While veggies cool, mix together the glaze: In a separate bowl, blend the mustard, ketchup and molasses. Set aside.
In a large bowl, combine the beef, peppers, rosemary, egg, chicken stock, pork rinds, wheat gluten and eggs; adding the onions, garlic and mushrooms last.
Season, to taste, with salt and pepper. Mix well. Should be a doughy consistency and not watery.
Place a lightly greased sheet of parchment paper on a cookie tray.
Form a nice loaf with the meat. It should be roughly 18 inches long, by 4 to 6 inches wide.
Pour the glaze over the meatloaf and cover evenly with spoon or brush.
Bake for about 1 hour or until an internal temperature of 160°F.
Make sure to let rest about 15 minutes prior to slicing.