Whisk together the flour, baking powder and salt..
In a separate bowl, mix together the milk, melted butter, egg and sour cream until the egg is lightly beaten into the milk.
Pour the wet mixture into the bowl with the dry ingredients and use a wooden spoon to combine. Do not over mix. Stir just until the dry ingredients are incorporated into the wet mixture.
Gently stir in the cheese and green onions.
Pour into the loaf pan and bake for 50-60 minutes, or until a toothpick comes out clean.