Preheat oven to 325 degrees.
Place broken up pieces of bread into a food processor and turn on/pulse until the large pieces become breadcrumbs. This should take about 1 minute. Place in large mixing bowl.
Add garlic, shallots, bell pepper and mushrooms to the food processor and pulse until everything is a small mince.
Combine all ingredients into the large mixing bowl.
Mix all ingredients until everything is well combined.
Press mixture tightly into a greased and lined loaf pan.
Place pan in the oven and cook until internal temperature reaches 155 degrees, about 1½ hours and uncovered.
Allow meatloaf to rest at least 20 minutes before slicing and serving.
Feel free to sear slices of meatloaf in a sauté pan for extra browning. Enjoy with your favorite sauce or as is.