Prepare Maple Mustard Sauce: In a medium bowl, whisk together mayonnaise, mustard, and real maple syrup until smooth and well combined. Set aside.

Cook Bacon: Heat a skillet over medium heat, add bacon strips, cooking until crispy and golden brown, about 4–5 minutes per side. Transfer to paper towels to drain and chop into bite-sized pieces.

Cook Maple Sausage: Using the same skillet, add maple sausage and cook over medium heat until fully browned, about 6–8 minutes.

Scramble Eggs: In a bowl, whisk together eggs, milk, salt, and pepper. Cook gently in a non-stick skillet over low heat until soft and creamy, about 5–7 minutes.

Warm Croissants: Preheat oven to 350°F (175°C), slice croissants in half, and bake on a baking sheet for 3–4 minutes until lightly warmed through.

Assemble Sandwiches: Spread maple mustard sauce on each croissant half, layer scrambled eggs, cooked sausage, chopped bacon, and top with cheese.

Melt Cheese: Return sandwiches to the oven for 2–3 minutes until cheese is melted.

Serve: Remove from oven, garnish with chopped chives, and serve immediately while warm.