Add the butter, cinnamon, brown sugar, and nutmeg to a small bowl and whisk until all ingredients are incorporated. Place bowl in the freezer while you make the french toast.
Preheat a skillet sprayed with cooking spray to medium high heat.
In a mixing bowl, mix together eggs, milk, vanilla, and pumpkin. Whisk until well combined. In a small bowl, mix together flour, cinnamon, and brown sugar. Add dry ingredients into the wet and whisk until combined.
Dip your bread into the egg mixture, coating both sides. Shake off excess. Do not let soak or you will get soggy bread.
Add to hot pan and cook until golden brown, about 3-4 minutes per side.
Serve immediately topped with frozen butter pieces.