Mix together the flour, cornmeal, coconut sugar, and salt until combined. Using either a pastry cutter of a pair of forks, cut the butter into the mixture until the biggest pieces of butter resemble pea-sized crumbs. Add in the buttermilk and stir until the dough begins to come together. (Add extra buttermilk by the tablespoon if needed!) Knead the dough on a lightly floured surface until it's combined. Roll it into a ball, flatten it into a disk, wrap it in plastic, and stick in the fridge for at least one hour.

While the crust is chilling, peel, core, and slice your apples into 1/4 inch slices. Place them into a bowl and toss with melted butter, coconut sugar, and chai spice until each one is coated.

Preheat your oven to 400 degrees and line a large baking sheet with parchment paper.

While oven is preheating, roll out your crust into a circle (or any shape, really). Move to the prepared baking sheet. Layer the apples into the center of the crust, leaving AT LEAST two inches of border all around. Stack up the apples to get them all to fit.

Gently fold the edges of dough over the sides of the apples on all sides, pressing lightly to seal it up. It's okay if it's not perfect - it'll still taste amazing!

Using a pastry brush or your fingers, brush the edges of the crust with egg wash and place into the oven for the first bake: 10 minutes.

In a small bowl, toss the cubes of butter with vanilla, oats, coconut sugar, honey, and chai spice until combined.

After 10 minutes, remove the galette from the oven and sprinkle the crumble topping over it. Place back into the oven for 10 minutes, or until the crust and the crumble are nice and golden brown.

Let sit at least 30 minutes before slicing. Top with some ice cream or whipped cream and dig in!