Preheat the oven to 350°. Spray a 9-inch cake pan (with sides at least 2 inches tall with baking spray.
Line the pan with a circle of parchment paper. Line a sheet pan with foil. Set both pans aside for now.
Stir the butter until light and creamy.
Add the sugar and vanilla and stir again until well combined. (It will not be smooth and creamy at this point but instead thick with a sandy texture.)
Add green food coloring, stirring after each drop until the desired shade of green is reached. (I used 5-6 drops.)
Pour the batter into the prepared pan and smooth the top to an even layer with an offset knife or spatula.
Pick the pan up, lift it a few inches above the counter and let it drop. Repeat this 3-4 times to bring any air bubbles to the surface. Let the pan sit for a minute or two then proceed with the next step.
See Café Tips above in the post for more detailed instructions and tips to ensure success.
If you prefer to use Metric measurements there is a button in each of our recipes, right above the word “Instructions”. Just click that button to toggle to grams, milliliters, etc. If you ever come across one of our recipes that doesn’t have the Metric conversion (some of the older recipes may not), feel free to leave a comment and I will add it.