01 - In a mixing bowl, whisk eggs, milk, salt, and black pepper until fully blended.
02 - Melt 1/2 tablespoon unsalted butter in a nonstick skillet over medium heat. Add the whisked eggs and gently scramble until just cooked through. Remove eggs from pan and set aside.
03 - Wipe out the skillet. Place one flour tortilla on a clean cutting board. Evenly spread ricotta cheese over the surface.
04 - Top the ricotta with scrambled eggs, shredded cheddar cheese, chopped chives or green onions, and diced red bell pepper if desired. Cover with the remaining tortilla and press gently.
05 - Melt remaining butter in the skillet over medium heat. Gently slide the filled tortilla into the pan. Cook for 2 to 3 minutes per side, turning once, until golden brown and cheese has melted.
06 - Transfer the quesadilla to a cutting board, allow to cool for 1 minute, then slice into wedges. Serve immediately, garnished as desired.