Preheat oven to 500˚F.
Lightly grease a 13x18 rimmed baking sheet with cooking spray and line with parchment paper; set aside.
Break eggs into a medium sized mixing bowl and whisk in buttermilk, honey, and vanilla. Set aside.
In a large mixing bowl, combine flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
Whisk the buttermilk mixture into the flour mixture.
Whisk in the melted butter.
Mix just until combined; do not overmix. Batter will be lumpy.
Pour batter into the prepared baking sheet and spread it out evenly.
Top with sliced fresh berries and chocolate chips.
Reduce oven temperature to 425˚F.
Place sheet pan in the oven and bake for 16 to 17 minutes, or until a toothpick inserted in the center comes out clean.
Remove from oven and let stand 3 to 5 minutes.
Cut into 12 squares and serve with maple syrup.