01 - In a mixing bowl, whisk together eggs, milk, salt, and pepper until thoroughly combined.
02 - Heat 1/2 tablespoon unsalted butter in a nonstick skillet over medium heat. Add the egg mixture and scramble gently until just set. Remove eggs from skillet and set aside.
03 - Wipe the skillet clean. Lay one flour tortilla flat on a clean cutting board. Evenly spread ricotta cheese over the entire surface.
04 - Top the ricotta with scrambled eggs, shredded cheddar cheese, chopped chives, and diced red bell pepper if using. Place the second tortilla on top, pressing gently to seal.
05 - Melt the remaining 1/2 tablespoon butter in the skillet over medium heat. Transfer assembled quesadilla to the skillet and cook for 2 to 3 minutes on each side until golden brown and cheese is melted.
06 - Remove quesadilla from skillet, allow to cool for 1 minute, then cut into wedges. Serve immediately.