Prepare the crust: Preheat oven to 325°F. Spray a 9-inch springform pan with cooking spray. Gather your ingredients. Stir together graham cracker crumbs, melted butter, and granulated sugar in a medium bowl until thoroughly combined. Press mixture on bottom and 1½ inches up sides of prepared springform pan. Bake in preheated oven until lightly browned and fragrant, about 8 to 10 minutes. Cool Crust completely in pan on a wire rack, about 20 minutes. Wrap outside of pan in a double layer of heavy-duty aluminum foil.

Prepare the filling: Beat cream cheese with a stand mixer fitted with a paddle attachment on medium speed until creamy, about 2 minutes. Gradually add sugar and flour, beating until smooth, about 1 minute. Add eggs, 1 at a time, beating just until yellow disappears after each addition. Add egg yolks, 1 at a time, beating just until yellow disappears after each addition. Beat in lime zest, lime juice, and heavy whipping cream on low speed just until combined. Pour Filling into cooled Crust.

Make hot water bath: Place springform pan in a roasting pan. Add hot water to roasting pan to reach halfway up sides of springform pan. Bake at 325°F until center is almost set but still slightly wobbly, 1 hour and 15 minutes to 1 hour and 25 minutes. Turn off oven, and let cheesecake stand in oven, with door partially open, 1 hour.

Cool cheesecake: Remove cheesecake from roasting pan, and place on wire rack. Remove foil from outside of pan, and cool cheesecake completely, about 2 hours. Cover with plastic wrap (avoid touching top of cheesecake), and chill until very cold, at least 8 or up to 24 hours. Run a knife around outer edge of cheesecake to loosen from sides of pan, if needed. Remove sides of pan.

Prepare topping and finish the cheesecake: Beat heavy whipping cream and vanilla in a medium bowl with an electric mixer on medium-high speed until foamy, about 20 seconds. Gradually add powdered sugar, and beat until stiff peaks form, about 1½ minutes. Place cheesecake on a serving platter; dollop with Topping, and gently spread over top of cheesecake. Garnish with graham cracker crumbs and Key lime slices. Cover any leftovers with plastic wrap, and store in refrigerator up to 5 days.