You’ll want to make your key lime cheesecake filling about an hour ahead of time. In a bowl, mix together the cream cheese with the icing sugar, key lime zest and key lime juice.
Line a plate or small baking sheet with parchment paper and scoop out 23 heaping teaspoons of the cheesecake mixture. Place on the parchment paper and freeze for 45 minutes, or until frozen. Note, if you’re using vegan cream cheese this might take longer!
In a large bowl with a handheld mixer, mix the butter, white sugar, light brown sugar and key lime zest together until soft and fluffy. Add the egg, vanilla extract and key lime juice. Beat until combined.
Pour in the flour, baking soda and salt and mix until just combined.
Preheat your oven to 350°Fahrenheit and line two baking sheets with parchment paper. Scoop out the cookie into 2 tablespoon sized cookie dough balls and place on the lined baking sheets.
Take the key lime cheesecake filling out of the freezer. Press one into the middle of each cookie dough ball, gently pressing down.
Use your hands to cover the cream cheese filling with the dough, making sure it is completely covered with the dough.
Bake the cookies one sheet at a time for 9-12 minutes, or until the edges have set and they’re a light golden brown. While one baking sheet is in the oven, place the other in the fridge so it doesn’t get too warm.