Brown the ground beef in a skillet over medium-heat, breaking the meat up with a spatula or wooden spoon. Add the envelope of taco seasoning, 1/4 cup of water and Worcestershire sauce. Simmer for a few minutes and transfer the taco meat to a large mixing bowl.
Melt the butter in the microwave. Add it to the bowl, along with the sour cream and one cup of the shredded cheddar cheese. Break up the potatoes and peppers in the bag and pour it into the bowl as well. Use a rubber spatula to mix everything together. Spread it evenly into a 9x13 casserole dish.
Cover the dish with foil. Bake for one hour. Remove the foil and top with the remaining one cup of shredded cheddar cheese. Bake for an additional ten minutes until the cheese is melted. Top the casserole with crushed Doritos. Plus sliced black olives, chopped tomatoes and avocado to serve.