Preheat oven to 350* F. Use coconut oil, vegetable shortening or pan spray to grease and flour a 9.5"-10" tart pan with a removable bottom. Then, sprinkle the pan with flour. See note!
In a large bowl, cream vegan butter and brown sugar together with either a wooden spoon or an electric hand mixer.
6 tablespoon Vegan Butter, room temperature, ¾ Cup Light Brown Sugar, packed
Add the non-dairy milk and vanilla and mix until combined. Then, add flour, baking soda and salt and mix until just combined.
3 tablespoon Non-Dairy Milk, 2 teaspoon Vanilla Extract, 1 ½ Cups All-Purpose Flour, ½ teaspoon Baking Soda, ¼ teaspoon Kosher Salt
Add the chocolate chips and use a rubber spatula to fold them into the cookie dough.
⅔ Cup Chocolate Chips
Scrape the dough into the prepared tart pan and use your hands to evenly press it out all the way to the edges. If the dough sticks to your hands, rub them with a little canola oil.
Place the tart pan onto a baking sheet and bake the cookie cake in a 350* oven for 21-24 minutes or until the edges are golden brown.
Cool completely before frosting.