Step 1: Peel, core, and dice your apples into small, uniform pieces, about 1/2-inch. In a large skillet over medium heat, melt the unsalted butter.
Step 2: Add the diced apples to the skillet. Cook for 3-5 minutes, stirring occasionally, until they start to soften slightly. They should still have a little bite.
Step 3: Stir in the brown sugar, cinnamon, nutmeg, and a pinch of salt. Cook for another 2-3 minutes, stirring constantly, until the sugar is dissolved and the apples are coated in a fragrant, syrupy glaze. Remove from heat and let the apples cool completely.
Step 4: In a large mixing bowl, beat the softened cream cheese with granulated sugar and vanilla extract until smooth and creamy, with no lumps.
Step 5: In a separate, chilled bowl, whip 1 1/2 cups of heavy cream until stiff peaks form. Be careful not to over-whip, or it will become grainy.
Step 6: Gently fold the whipped cream into the cream cheese mixture until just combined. Be gentle to keep the cheesecake layer light and airy.
Step 7: Choose a large, clear trifle bowl (about 3-4 quart capacity). Start by spreading about one-third of the graham cracker crumbs evenly at the bottom of the bowl.
Step 8: Spoon half of the cooled spiced apple mixture over the graham cracker crumbs. Spread it out gently to create an even layer.
Step 9: Dollop half of the cheesecake cream mixture over the apples and carefully spread it to the edges of the bowl. Drizzle about one-third of the caramel sauce over the cheesecake layer.
Step 10: Repeat the layers: another third of graham cracker crumbs, the remaining half of the spiced apples, the remaining half of the cheesecake cream, and another third of the caramel sauce.
Step 11: Finish with the remaining graham cracker crumbs. If desired, whip the remaining 1/4 cup of heavy cream for a final topping. Drizzle generously with the remaining caramel sauce and garnish with toasted pecans or walnuts if you're using them.
Step 12: Cover the trifle and refrigerate for at least 4 hours, or preferably overnight. This chilling time allows the flavors to meld beautifully and the layers to set.