In a food processor, blend the beans and tahini until creamy. Add the garlic, spinach, olive oil, lemon juice and salt and blend. If spinach hummus is too thick, add 1 tablespoon water at a time until desired consistency. Hummus should be smooth and creamy.
For the Pita Chips
Preheat oven to 400°F. Cut the pita into strips or wedges. Toss with olive oil in a bowl. Lay the pita pieces on a baking pan in a single layer, using more than one pan if needed. Sprinkle with salt and bake until crispy.