Step 1: Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
Step 2: In a medium saucepan, melt butter over medium heat. Stir in brown sugar and corn syrup until smooth.
Step 3: Remove from heat and whisk in flour, vanilla, and salt until fully combined.
Step 4: Drop teaspoon-sized portions of batter onto prepared sheets, spacing them 3 inches apart.
Step 5: Bake for 8-10 minutes until golden and lacy. Let cool completely on sheets.
Step 6: Melt chocolate and coconut oil in a double boiler or microwave, stirring until smooth.
Step 7: Dip half of each cooled cookie into chocolate, then place on parchment to set.