In a large bowl, combine ground beef, gluten-free breadcrumbs, milk, onion, bell pepper, garlic, egg, salt, pepper, thyme, and oregano. Mix until well combined.
Shape the mixture into a loaf and place it in a baking dish.
Bake for 1 hour or until the internal temperature reaches 160°F (70°C).
While the meatloaf is baking, prepare the mushroom gravy. In a skillet, sauté the mushrooms in a little oil until they are browned.
Add beef broth and soy sauce to the skillet and bring to a simmer.
In a small bowl, mix cornstarch with a little water to create a slurry, then add it to the gravy to thicken.
Once the meatloaf is done, let it rest for a few minutes before slicing.
Serve the meatloaf with mushroom gravy on top.
Notes
Ensure all ingredients are gluten-free.
Leftovers can be stored in the refrigerator for up to 3 days.
This recipe can be easily doubled for larger gatherings.