Preheat oven to 350°F. If you have parchment or a silicone baking mat, I recommend using it to line your cookie sheet (but it's not strictly necessary).
In a small bowl or mug, stir together melted vegan butter, brown and white sugar, vanilla extract, baking soda, and a pinch of salt. Add in flour and stir until just combined.
*Only* if the dough is looking a little crumbly or dry, add in plant milk 1 teaspoon at a time and stir to combine. (I usually don't have to add milk, but this will depend on how you measure your flour.)
Stir in the chocolate chips.
Divide the cookie dough in half for 2 large cookies, or into 4 for regular-sized cookies.
Bake for 12 minutes for large cookies, or 10 for regular. The cookies will still look slightly underdone in the center. That's okay; they will firm up as they cool on the tray. Let them cool for about 5 minutes before enjoying.