Benne Wafer Sandwich Cookies

For Cookies: Preheat oven to 375°F (190°C). In a large mixing bowl, whisk together flour, salt and baking powder. Add sesame seeds, brown sugar, melted butter, egg and vanilla extract; mix until blended. Shape dough into dime-sized balls, place 2 inches apart on parchment-lined baking sheets (cookies will spread). Bake 4 to 6 minutes, or until lightly browned. Cool cookies directly on baking sheet until set (about 3 minutes). Transfer to rack to cool completely. For Filling: Place chocolate in medium microwave-safe dish. Microwave 30 seconds on high, stir and continue to microwave in 10 to 20-second intervals, stirring after each until chocolate is melted and smooth. Spread 1 teaspoon chocolate between two cookies; allow chocolate to set. Store cookies in airtight container at room temperature, separating layers with parchment paper, for up to 5 days.