Cheesy Chicken Broccoli Pot Pie

Ingredients

• 1 pound boneless skinless chicken breasts, cut into cubes
• 1 tablespoon canola oil
• 4 cups fresh broccoli florets
• 4 tablespoons butter
• 1/2 white onion, diced
• 3 tablespoons all-purpose flour
• 1 and 1/2 cups milk
• 1 cup shredded cheddar cheese
• 1 teaspoon salt
• 1/4 teaspoon black pepper
• 1 and 1/2 cups all-purpose flour
• 1/2 teaspoon salt
• 1/2 cup unsalted butter, cold and cubed
• 1/4 cup water
• 1 egg
• 1 tablespoon water, for egg wash