01 - Preheat oven to 350°F. Line 2 baking sheets with parchment paper or silicone baking mats.
02 - In a medium bowl, whisk together the flour and salt until evenly blended.
03 - In a large bowl, combine melted butter and sugar. Whisk until smooth and fully incorporated.
04 - Add egg, milk, orange zest, and vanilla extract to butter mixture. Whisk until completely combined.
05 - Add dry ingredients to wet ingredients. Stir until just combined; batter will be thin.
06 - Drop rounded teaspoons of batter onto prepared baking sheets, spacing at least 3 inches apart to allow for spreading.
07 - Bake for 7-9 minutes until edges are golden brown and lacy. Watch closely to prevent burning.
08 - Let cookies cool on baking sheet for 2 minutes, then gently transfer to wire rack to cool completely.
09 - Once cooled, drizzle or dip cookies in melted dark chocolate. Let set before serving.