Cook and Peel the eggs - Cook the eggs, and cool. Once the hard boiled eggs have cooled, peel.
Cut and Remove Yolks - Cut the eggs in half horizontally, and spoon out the egg yolks to a bowl.
Making Filling - In a bowl, mash the avocado with a fork. Add the egg yolks, lime juice, red onion, jalapeno, cilantro, tomatoes, salt, pepper, and mix well. Taste for seasoning and adjust to taste.
Assemble and Serve - Scoop heaping spoonfuls of the guacamole into the 12 halved egg whites. Sprinkle with a little chili powder and arrange on a platter. Serve.
Store leftovers covered in plastic wrap or in an airtight container in the fridge. Leftover guacamole deviled eggs should be eaten within 3-4 days, but because of the avocado, the filling will turn a bit brown.
Please keep in mind that nutritional information is a rough estimate and can vary greatly based on products used.