Mix together the cream cheese, powdered sugar, 1 tablespoon lime zest and 2 teaspoons lime juice. Mix until smooth and no lumps of cream cheese remain. Use a stand- or hand-mixer.
Place lime filling in a piping bag. Pipe twelve 1" discs on a piece of parchment or wax paper. Alternatively, if you don't have a piping bag, spoon the filling onto the paper and flatten slightly.
Place discs in the freezer for at least 1 hour or until frozen.
Cookies
Preheat oven to 350℉
Prepare 2 baking sheets by lining with parchment paper or silicone baking mats.
In a medium bowl, whisk together flour, baking soda, salt and lime zest. Set aside
Using a stand-mixer with the paddle attachment, begin mixing butter and granulated sugar until light and fluffy (approximately 2 - 4 minutes on medium speed). Using a rubber spatula, Note: a hand mixer may also be used.
Add the egg and lime juice to mixing bowl. Mix on low speed until incorporated. Scrape down sides of the bowl as needed.
Add the flour mixture and mix on low speed until combined. Scrape down sides of the bowl as needed.
Create 12 flat discs of cookie dough. Discs should be approximately 1" in diameter and ⅛ of an inch thick.
Scoop the remaining dough onto the parchment-lined baking sheets using a cookie scooper (2 tablespoon per cookie). Leave approximately 2 inches of space between each cookie.
Using the back of a tablespoon or a dough tamper, make an indentation in each cookie. Remove discs from freezer. Place a disc in the center of each cookie. Place the 12 discs of cookie dough over the lime filling. Roll each cookie to seal the disc inside.
Optional. Roll cookies in graham cracker crumbs and place back on cookie sheets.
Bake cookies for 14 - 16 minutes or until the tops are a pale golden color.
Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer cookies to a wire rack to cool completely.