Elsie's Bite Size Chicken Pot Pie

Instructions
Add the butter to a pot over medium heat.
Once the butter has melted, ddd the chicken and cook until no longer pink and cooked through, about 6-7 minutes.
Add the sliced onion and cook until translucent and soft, about 4-5 minutes.
Add diced carrots and peas and cook for 1-2 minutes.
Sprinkle flour into the mixture. Stir until well blended, then season with salt and pepper.
Add the milk and stir constantly until the mixture is thickened.
