Bring a pot of salted water to a boil and cook the chickpea pasta according to package directions until al dente, then drain and rinse with cold water to stop the cooking.
Heat a large skillet over medium-high heat and add the lean ground beef, breaking it apart with a spatula into small crumbles.
Season the beef with the dried oregano, sea salt, and black pepper, cooking until the meat is browned and fully cooked through.
While the beef is browning, halve the cherry tomatoes, dice the cucumber into bite-sized pieces, and finely mince the red onion.
In a large mixing bowl, whisk together the extra virgin olive oil and lemon juice to create a bright and simple dressing.
Add the cooled pasta, cooked beef, tomatoes, cucumber, red onion, and baby spinach to the mixing bowl.
Toss all ingredients thoroughly until evenly coated in the dressing and the spinach begins to slightly wilt from the residual warmth of the beef.
Transfer the salad to a serving bowl, top with the crumbled feta cheese, and enjoy immediately or store in the refrigerator for a chilled meal.