1. Cook the ground beef in a small skillet over medium heat until it's no longer pink (about 4-6 minutes). While cooking, crumble the beef into small pieces. Drain any excess fat. Add the pine nuts, salt, and pepper to the skillet and stir to combine. Let the mixture cool slightly before stirring in 2 tablespoons of plain yogurt.
2. Arrange the pita chips on a large serving platter. Layer the beef mixture, tabbouleh, hummus, tomatoes, olives, parsley, mint, and remaining yogurt on top of the chips. If desired, you can also add thinly sliced red onion to the platter. Serve immediately and enjoy!