Cook the pastaBring a pot of salted water to a boil. Cook pasta according to package instructions until al dente. Reserve ½ cup pasta water, then drain and set aside.
Cook the baconIn a large skillet over medium heat, cook chopped bacon until crisp. Remove with a slotted spoon and transfer to a paper towel-lined plate.
Add greens & pastaStir in spinach or arugula, chickpeas and mix. Add to cooked pasta toss everything together. Drizzle with 1–2 tablespoons olive oil and add a splash of reserved pasta water to help everything combine into a light sauce.
Finish & serveStir in crumbled feta and the cooked bacon and dressing. Season with salt, pepper, and optional red pepper flakes or lemon juice to taste. Garnish with fresh herbs if desired. Serve warm—or enjoy cold as a pasta salad!