Preheat oven to 325°F (165°C).
Grease a baking pan and line with parchment paper.
In a medium bowl, whisk together the granulated sugar, flour, powdered sugar, cocoa powder, and salt.
In a large bowl, whisk together the eggs, olive oil, water, and vanilla extract.
Add the dry ingredients to the wet ingredients and mix until just combined.
Fold in the semi-sweet chocolate chips and Reese's Peanut Butter Chips.
Spread the batter into the prepared baking pan.
Bake for 40-48 minutes, or until a toothpick inserted in the center comes out clean.
Allow the brownies to cool completely before cutting and serving.
