Prep all ingredients according to the ingredient list.
In a bowl, season the ground beef with chili powder, ground cumin, garlic powder, salt, and black pepper.
Heat extra-virgin olive oil in a skillet over medium heat. Add the seasoned ground beef and cook, breaking it into small pieces, until fully browned. Remove from heat.
Warm the soft taco shells in a pan over medium heat until pliable on both sides.
Fill the taco shells with the cooked beef. Top with diced onion, diced tomatoes, shredded Monterey Jack cheese, and lettuce.
In a bowl, mash the avocado until smooth. Add fresh cilantro, lime juice, garlic powder, cumin, salt, and black pepper. Stir until well combined.
Combine lemon, chia seeds, and sparkling water. Stir well and let sit until the chia seeds bloom.
Serve the tacos with tortilla chips and guacamole alongside lemon chia sparkling water.