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| all-purpose flour (unsifted): 1 1/2 cups |
| granulated sugar: 1 cup |
| baking soda: 1/2 tsp |
| salt: 1/2 tsp |
| unsweetened cocoa powder (sifted): 1/4 cup |
| vanilla extract: 1 tsp |
| distilled vinegar: 1 tsp |
| olive oil: 1/2 cup |
| water: 1 cup |
| semisweet chocolate chips (chips): 1/3 cup (optional) |