First, preheat oven to 350 degrees Fahrenheit. Generously spray a muffin pan with nonstick spray.

In a large mixing bowl, add cold butter, sugar and brown sugar. Mix on high until no clumps of butter remain, about 2 to 3 minutes.

Then, add in egg and vanilla. Stir to combine.

Add in flour, baking soda and sea salt. Stir to combine.

Fold in chocolate chips.

Use an ice cream scooper or large spoon to scoop dough into sprayed muffin cavities. This should make 10 to 12 cookie cups.

Then, use your fingers to gently press dough down into muffin cavity and around the edges.

Bake for 14 to 17 minutes or until edges are golden. The middles will still be a little gooey.

Finally, remove from oven. Immediately use a jar lid or large spoon to press down in the middle. Allow cookie cups to cool in the muffin pan for 10 minutes.

Lastly, gently remove and place on cooling rack. Top with desired toppings.