Fairfax Breakfast Sandwich with Caramelized Onions and Chives - cookrisp

Ingredients

• 3 tbsp unsalted butter, divided
• 1 tbsp cooking oil
• 1 medium yellow onion, sliced
• 1/4 cup water
• 3 large eggs
• 2 tbsp chives, thinly sliced
• 2 tbsp mayonnaise
• 1 tbsp Sriracha
• 1 brioche bun, sliced
• 1 slice cheddar cheese
• Salt to taste
• Pepper to taste