Prep – Preheat oven to 375°F (190°C). Line 2 baking sheets.
Filling – Mix melted butter, brown sugar, corn syrup, egg yolk, vanilla, salt, cinnamon, and nutmeg until smooth. Stir in chopped pecans.
Assemble – Separate crescent dough. Add 1 tbsp filling to wide end of each triangle. Roll into crescents and place seam-side down. Brush with beaten egg and top with a pecan half.
Bake – 12–15 min until golden. Cool 5–10 min.
Glaze (Optional) – Whisk powdered sugar, milk, and vanilla; drizzle over cooled crescents.
Notes
Toast pecans first for richer flavor.Don’t overfill to avoid leaks.Best enjoyed the same day, but leftovers keep up to 3 days in an airtight container.