Preheat oven to 400 F
Mashed potatoes: Boil a large pot of water and add skinned and chopped russet potatoes, add a pinch of salt - boil until very soft, drain water, mash and add another pinch of salt and 2-3 tbsp butter - add a spice (optional)
While mashed potatoes are cooling down, drizzle 1 tbsp olive oil on a skillet and add chopped carrots, diced garlic, frozen peas, chopped onion and cook for 1 minute then add ground beef.
Once cooked season with rosemary, oregano, salt, pepper and chili powder, and stir
Assembly: In a pan scoop out meat mixture then layer with mashed potatoes. Add shredded cheese (optional)
Cook at 400 for 30 minutes then switch to the broil setting at 400 for 5 minutes
Leftovers: store in the fridge for up to 5 days. Reheat on the warm setting for 15 minutes or until warm