Add all-purpose flour, unsweetened cocoa powder, baking powder and fine sea salt to small mixing bowl. Whisk to combine. Set aside.
Add dark chocolate chunks and unsalted butter to small saucepan, and melt over low heat, stirring constantly until both have melted completely and are well combined.
Remove from heat and cool slightly.
While chocolate is cooling, beat granulated sugar, brown sugar, and eggs for 4 minutes on medium speed. Add vanilla bean paste and mix until combined.
Add melted chocolate mixture to stand mixing bowl and beat on low for 1 minute or until well combined.
Add flour cocoa mixture to stand mixing bowl. Using a spatula, fold in flour until batter is thick and smooth.
Cover batter and chill 30 to 45 minutes.
Preheat oven to 350 F. Line cookie sheets with silicone baking mats or parchment paper.
Using a 2 tablespoon cookie scoop, drop cold batter onto prepared pans, leaving several inches between cookies as the dough will spread during baking.
Bake 10 minutes, or until cookies have set on the edges and are still slightly undone in the center. Do not over bake.
Remove cookie sheets from oven and place on wire racks. Cool cookies completely on cookie sheets.
Store cookies in an airtight container at room temperature. Baked cookies will keep in an airtight contianer in freezer for several weeks.