Line a 12-cup muffin tin with paper liners; set aside.
Using a medium bowl, add graham cracker crumbs, brown sugar and melted butter; stir until well combined.
Divide crust mixture evenly into lined muffin tin. (Tip: Pack mixture down into liners using a small flat-bottomed glass.)
Bake for 5 minutes. Remove from oven and set aside to cool.
For the Cheesecake
Using a stand mixer, beat the cream cheese on medium speed until completely smooth (about 3 minutes).
Add sugar and mix well, scraping down the sides of the bowl as needed.
Whisk the eggs and egg yolk together and add to the bowl; mix until well combined.
Add the sour cream, vanilla extract, tequila, lime juice and lime zest; mix until well combined. (Tip: Use a spatula to scrape the sides and bottom of the bowl to ensure the filling is fully mixed.)
Spoon batter evenly into muffin cups. (Note: Pour the batter all the way to the very top of the muffin liners.)
Bake for 20 minutes, or until centers of cheesecakes are just barely set. (Note: The center of each cheesecake should still be slightly loose. If the cheesecakes begin to crack, remove from oven immediately.)
Let cheesecakes cool for 15 minutes and then transfer to freezer for 1 hour.
Remove paper liners from cheesecakes
Before serving, garnish tops of cheesecakes with freshly prepared whipped cream and lime slices.