Heat oven to 350°F. Grease a 9-inch pie plate.
Melt the butter and let it cool for two minutes.
Whisk the sugar with the beaten eggs until slightly foamy.
Add milk, baking mix, vanilla, salt, nutmeg, and melted butter. Blend until smooth.
Pour the batter into the pie plate. Tap gently to release bubbles.
Bake 45–50 minutes until golden and center barely jiggles. Cool before slicing.