Preheat the Oven: Begin by preheating your oven to 350°F (175°C). This ensures even baking.
Melt Butter and Chocolate: In a medium microwave-safe bowl, combine the unsalted butter and semi-sweet chocolate chips. Microwave in 30-second intervals, stirring in between, until fully melted and smooth.
Mix Wet Ingredients: In a large mixing bowl, whisk together the eggs, granulated sugar, and vanilla extract until well combined and slightly frothy.
Combine Chocolate Mixture: Gradually pour the melted chocolate mixture into the egg mixture, stirring continuously until fully incorporated.
Add Dry Ingredients: Sift in the all-purpose flour and salt, gently folding until just combined—be careful not to overmix!
Prepare the Baking Dish: Grease an 8x8 inch baking dish and pour half of the brownie batter into it, spreading it evenly.
Create Lava Centers: Make small indentations in the batter and pour remaining batter over them, sealing the gooey centers.
Bake: Bake in your preheated oven for about 20-25 minutes or until the edges are set but the center is still slightly jiggly.
Cool and Serve: Allow brownies to cool for a few minutes before cutting into squares. Serve warm with your favorite toppings!