Step 1: Preheat your oven to 350°F (175°C) to ensure even baking.
Step 2: In a mixing bowl, whisk the melted butter and sugar until combined. Add the eggs one at a time, mixing well after each. Stir in the vanilla extract.
Step 3: In a separate bowl, sift together the flour, cocoa powder, and a pinch of sea salt to avoid lumps.
Step 4: Gradually mix the dry ingredients into the wet mixture until just combined. Fold in the chocolate chunks or chips.
Step 5: Prepare your 9x5 inch baking dish by greasing it or lining it with parchment paper.
Step 6: Pour the batter into the dish, spreading it evenly. Bake for about 20-25 minutes, checking for doneness with a toothpick.
Step 7: Let the brownies cool for about 10 minutes before cutting into squares and serving.
