Prep the pan. Heat oven to 400°F (205°C). Line a large sheet pan with parchment and brush with melted butter or oil.
Slice the bread. Cut each slice into 3 even sticks. If the bread is super fresh, leave sticks out for 10–15 minutes to dry slightly.
Whisk the custard. In a shallow dish, whisk eggs, milk, vanilla, cinnamon, nutmeg, salt, and optional maple/honey until smooth.
Dip efficiently. Dip each stick for 3–4 seconds per side. You want soaked, not soggy. Let excess drip off.
Arrange for success. Place sticks on the prepared pan, leaving space between them. This is how crisp happens.
Bake, flip, bake. Bake 10 minutes, flip, then bake another 8–10 minutes until golden-brown and lightly crisp at the edges.
Mix the dip. Stir Greek yogurt with honey/maple, lemon zest, cinnamon, and vanilla until silky. Adjust sweetness to taste.
Serve hot. Plate with the yogurt dip. Optional: dust with cinnamon or drizzle a tiny bit of maple. You're the boss.