Step 1: Preheat and Prepare

1. Preheat oven to 350°F (175°C).
2. Line baking sheets with parchment paper or silicone baking mats.

Step 2: Make the Cookie Dough

1. In a saucepan, melt 1 cup butter with 1 cup water over medium heat.
2. Remove from heat and stir in 1/2 cup cocoa powder until smooth. Let cool slightly.
3. In a mixing bowl, whisk 2 cups sugar, 2 eggs, and 1 tsp vanilla.
4. Slowly add the slightly cooled chocolate mixture, whisking to combine.
5. In a separate bowl, whisk flour, baking soda, cinnamon, and salt.
6. Gradually mix the dry ingredients into the wet until just combined.

Step 3: Scoop and Bake

1. Drop spoonfuls of dough (using a tablespoon or cookie scoop) onto the baking sheet.
2. Space about 2 inches apart.
3. Bake for 8–10 minutes, until edges are set but centers are soft.
4. Cool on the baking sheet for 5 minutes, then transfer to wire racks.

Step 4: Prepare the Glaze

1. In a saucepan, melt 1/2 cup butter with 1/4 cup milk and 1/4 cup cocoa powder.
2. Remove from heat and whisk in powdered sugar and 1 tsp vanilla until smooth and glossy.

Step 5: Glaze the Cookies

1. Once cookies are cool, drizzle or spread glaze over each cookie.
2. Allow glaze to set for 10–15 minutes before serving.