Veggie Egg Bites | Kara Lydon

Ingredients

• 1 tablespoon unsalted butter (plus extra for greasing pan)
• 1/2 cup diced onion (from 1/2 small onion)
• 1 cup roughly chopped cremini mushrooms (from about 8 mushrooms)
• 1 cup diced red bell pepper (from 1 bell pepper)
• 1/2 cup (packed) baby spinach
• 9 eggs
• 1/3 cup milk
• 2 teaspoons dijon mustard
• Salt and pepper
• 1 tablespoon chopped chives
• 1 cup shredded cheddar cheese