Place bacon in a large cast-iron skillet over medium heat; cook 5 minutes or until just starting to crisp. Add onion; sauté 3 minutes. Add garlic; sauté 1 minute. Add bell peppers; sauté 4 minutes. Add potato, salt, crushed red pepper, and stock. Cover and cook 9 minutes or until potatoes are tender. Add spinach; cook, uncovered, 1 minute or until spinach wilts. Divide mixture between 2 bowls; sprinkle with cheese.