Heat the avocado oil in a medium skillet over medium-high heat.
Add the ground beef to the skillet, breaking it up with a spatula as it cooks.
Season the beef with sea salt, black pepper, and garlic powder, stirring to incorporate.
Cook until the beef is thoroughly browned and cooked through, approximately 7-8 minutes, then remove from heat.
Prepare the base of the bowl by placing the chopped romaine lettuce in a large serving dish.
Layer the cooked ground beef, halved cherry tomatoes, diced red onion, and sliced dill pickles over the lettuce.
Slice the avocado and place it on top of the assembled ingredients.
Drizzle the yellow mustard over the bowl and serve immediately.