Make the guacamole. Place the avocado in a small bowl and mash well with a fork. Add remaining ingredients and stir well to combine. Cover with plastic wrap and refrigerate until needed.
Make pico de gallo. Combine all ingredients in a small bowl and toss to combine. Cover with plastic wrap and refrigerate until needed.
Make Queso sauce. Cut velveeta cheese into small chunks (so it will melt faster) and place in a medium saucepan with the other queso ingredients. Heat over medium heat, stirring constantly until cheese melts. Reduce heat and let mixture simmer 15 minutes.
Heat a gas grill or grill pan over medium heat. Season the ground chuck with salt, pepper, and 1/4 teaspoon garlic powder. Shape into 4 patties. Cook for approximately 5 minutes per side or until desired degree of doneness.
To assemble, place lettuce on bottom bun half, topped by guacamole and a burger patty. Ladle with queso. Add pico de gallo, pickled jalapenos (if desired) and crushed tortilla chips and top with other half of bun.