Creating delicious Green Monster Brownies is straightforward when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and line an 8×8 inch baking pan with parchment paper.
2. Blend Spinach: In a blender, combine the fresh spinach with 2 tablespoons of water. Blend until smooth and set aside.
3. Combine Dry Ingredients: In a large bowl, whisk together the cocoa powder, flour, baking powder, and salt.
4. Mix Wet Ingredients: In another bowl, mix the melted butter, sugar, eggs, and vanilla extract. Blend until fully combined.
5. Add Spinach: Stir the pureed spinach into the wet ingredients until well mixed.
6. Combine Mixtures: Gradually add the dry mixture to the wet ingredients, stirring until just combined.
7. Add Chocolate Chips: Fold in the semi-sweet chocolate chips for extra richness.
8. Bake: Pour the batter into the prepared baking pan. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool Down: Allow the brownies to cool in the pan for 15-20 minutes before transferring them to a wire rack for complete cooling.
10. Slice and Enjoy: Once cooled, cut into squares and enjoy the delightful Green Monster Brownies!