Preheat oven to 400F. Heat large skillet to medium heat, add sausage and break up as it browns with spatula. Once it's just cooked, add onion, and saute another 4-5 minutes. Add garlic, 1 min. Add tomatoes and stock, seasonings, and BTB, then RTS about 10-15 minutes. Turn off heat.
While cooking, char peppers (or par-boil in pot on stove) to soften gently. Using the grill adds a lovely smoky flavor.
Add cooked rice and quinoa to large bowl with sausage mixture. Mix thoroughly. Add parm and stir. Stuff peppers with small spoon (pack well). Back on tinfoil lined sheet tray for 20 minutes. Enjoy!
Notes
This filling can be used to stuff full-sized bell peppers as well. Do everything the same but add an additional 10 minutes to the time in the oven.