Preheat oven to 400 degrees. Spray four 8-ounce ramekins with PAM. Prepare grits according to package directions. Stir in spinach and 2 tablespoons cheddar. Cook until cheddar melts, about 30 seconds.Divide grits among dishes. Make a well in each, then crack an egg into each well. Top with bacon bits.Bake on a rimmed baking sheet until whites are set but yolks are still runny, about 20 minutes, rotating sheet halfway through.To serve, top with remaining 2 tablespoons cheddar and a sprinkle of freshly ground pepper.