Preheat the oven to 400 degrees.
Put the diced red onion and minced garlic into a large pot. Top with 2 tsp of olive oil, mix oil into the onion and garlic with a spatula and heat the pot over medium high heat. Let the onions and garlic cook for 2 1/2 minutes.
Then, add the ground turkey to the pot. Using a rubber spatula, push down into the turkey, trying to break it up into pieces. Add 2 tsp of salt, 1 tsp of ground black pepper, and 1/8 tsp crushed red pepper to the meat. Let the meat cook for 5 minutes, mixing every so often, and making sure the meat breaks up into small pieces.
Add the 4 Tbs of tomato paste to the ground turkey and mix. Let the meat cook for 2 minutes.
Reduce the heat to medium, then add the strained and chopped tomatoes to the pot and stir. Add 2 tsp of basil and 1 1/2 tsp of oregano, mix, and let the mixture cook for another 5 minutes.
Reduce the heat to a simmer and cook for 2 minutes, and set aside.
Cut the tops off of 4 red peppers, empty out the inside seeds and extra skin.
Fill each red pepper with 1/2-3/4 cup of the ground turkey meat sauce, and place into a rectangular pan.
Put the sliced carrots and sweet potatoes in the empty space surrounding the peppers in the pan.
Top the carrots and sweet potatoes with the remaining ground turkey meat sauce.
Put the pan into the oven for 60 minutes. You'll want the peppers to soften and have a little bit of a burn on top.
Note: try eating your stuffed peppers with some honey, delicious!