Pat chicken breasts dry and season with salt and pepper.
Pan-fry chicken breasts until cooked through.
Remove the chicken from the pan and shred or chop into bite-sized pieces. Set aside.
In the same pan, add 1 tablespoon of butter and the onions, cooking until the onions are softened.
Add frozen vegetable mix and cook for 2 to 3 minutes.
Meanwhile, in a separate saucepan, make a roux by melting the remaining 2 tablespoons butter then whisking in flour and curry powder for 1 to 2 minutes.
Gradually whisk in chicken broth and milk. Simmer until thickened.
Pour the roux into the pan with the vegetables and stir to combine.
Add in shredded chicken, parsley, and salt and pepper to taste.