Preheat oven to 450°
After rinsing, cut bell peppers lengthwise and remove seeds and as much of the rib as possible.
Set pepper halves in a roaster on a roasting rack with a small amount of water. Cover with foil and place in preheated oven for approximately 15 minutes or until slightly tender.
Remove steamed peppers, pouring out any liquid that has accumulated in the cavity of the pepper and set aside to cool for handling.
In a large dutch oven, brown ground meat then strain.
In the same dutch oven, heat olive oil then add diced onions and celery and cook until soft. If onions start to stick, add a splash of beef broth.
Once veggies are tender, return the browned meat to dutch oven and add all seasonings with the exception of the beef broth.
Stir in 1 cup of beef broth and reserve the rest to use as needed.
Cook meat mixture for 10 minutes to allow flavors to blend.
Adding one cup of cooked rice at a time, stir until well incorporated until you reach desired rice to meat ratio.
Add a little beef broth if needed and heat rice/meat mixture on low for 5 minutes.
Carefully spoon mixture into pepper cavities and place peppers in a roasting pan.
Bake stuffed peppers in preheated oven, uncovered for 10 minutes.
Remove peppers from the oven, sprinkle tops with bread crumbs then return to the oven under the broiler setting for 3-5 minutes. Every oven can be different, watch this step carefully.