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| eggs: 2 (large) |
| unsalted butter: 1 cup (softened) |
| salt: 1 tsp |
| vanilla extract: 1 tsp |
| lemon zest: 1/2 tsp (finely grated) |
| hazelnuts - filberts (whole): 1 cup (chopped) |
| baking soda: 1 tsp |
| milk chocolate chips: 2 cups |
| unsweetened cocoa powder (sifted): 1/4 cup |
| light brown sugar (packed): 3/4 cup |
| granulated sugar: 3/4 cup |
| nutella: 1/3 cup |
| all-purpose flour (unsifted): 2 1/2 cups |
Credit: Food.com