Line a deep edged sheet pan with parchment or foil and lay out 6 pieces of bacon. Preheat oven to 425 degrees. Place pan in oven and cook bacon for 15-18 minutes until golden brown and crispy. Place cooked bacon on a plate lined with paper towels to drain. Set aside.
Rinse & dry peppers. Place on a cutting board and using a sharp knife cut peppers in half from stem to bottom of pepper for 2 halves. Remove any membrane and seeds. Prepare other 2 peppers the same way.
Fill a large pot about 1/3 of the way up with water. Bring to a boil. Add in 1/2 tsp salt. Place the 6 pepper halves into boiling water for 3-5 minutes until halfway tender. Remove peppers and pat dry and place facing up in prepared 8 x 11 baking dish.
In a medium bowl mix together ground beef, diced onion, minced garlic, eggs, almond flour, ketchup, 1/2 cup cheddar cheese, parmesan cheese, garlic powder, onion powder, chili powder, black pepper, salt.
Divide mixture into 6 equal portions. Place 1 portion of meat mixture into each pepper half mounding it up.
Place 2-3 TBS shredded cheddar cheese on top of the mixture. Top with 1 piece of bacon cut in half on top of the cheese. Finish the rest of the 5 pepper halves.
Turn oven temperature down to 400 degrees. Place peppers in oven for 35-45 minutes until meatloaf mixture is cooked through in the peppers. Use a kitchen thermometer to reach at least 165 degrees in center of meatloaf. Let cool for a few minutes and serve up with a garnish of green onions.