Halve and peel onion. Slice halves into thin strips. Stem, seed, and cut bell pepper into ¾" dice. Trim ends off green beans.
Caramelize the Onion and Bell Pepper
Heat a medium non-stick pan over medium-high heat. Add 1 tsp. olive oil and bell pepper to hot pan. Cook until tender, 4-6 minutes, and transfer to a mixing bowl. Return pan to medium-high heat, and add ½ tsp. olive oil and onion to hot pan. Cook until tender and brown, 6-9 minutes. Remove from burner. Reserve pan and wipe clean.
Form the Meatloaves
Add ground turkey, half the onion, meatloaf seasoning, Worcestershire sauce, and a pinch of salt and pepper to bowl with bell pepper and mix thoroughly. Divide half the mixture into four muffin cups. Tear cheese into quarters and place half in the center of meatloaf (reserve remaining cheese for topping), and top with remaining meatloaf mixture. Press around the edges of each cup to seal. Place on prepared baking sheet and roast until golden brown and turkey reaches a minimum internal temperature of 165 degrees,15-18 minutes. While meatloaves roast, cook green beans.
Cook Green Beans and Make Sauce
Return pan used to cook onions to medium-high heat. Add 1 tsp. olive oil and almonds to hot pan. Cook until lightly browned, 1-2 minutes. Add the green beans, 2 tsp. water, and a pinch of salt. Cover and cook until beans are tender, 3-4 minutes. While beans cook, add ¼ cup water and demi glace to small pan. Place over medium heat and bring to a simmer. Cook until thick enough to coat the back of a spoon, 1-3 minutes. Remove from burner and swirl in butter.
Finish the Dish
Top meatloaves with remaining onions and cheese. Return to oven and cook until cheese is melted, 3-5 minutes. Place sauce on a plate and top with meatloaves. Serve green beans alongside.