I start by mixing the graham cracker crumbs with melted butter until the mixture feels like wet sand. Then, I press it firmly into each muffin liner to form the base. Baking the crust at 325ºF for about 5 minutes ensures it stays crisp under the creamy filling.
In a large bowl, I beat the cream cheese until smooth, then mix in sugar, sour cream, eggs, vanilla, lemon juice, and salt. I make sure not to over-mix, which keeps the cheesecake creamy and crack-free. This filling is velvety and rich, perfect for the mini cakes.
I divide the cheesecake filling evenly among the muffin cups, then scatter the chopped apples on top. The apples add a fresh, tart contrast to the sweet, creamy base. They also soften during baking but keep a slight bite for texture.
In a small bowl, I combine oats, flour, brown sugar, melted butter, and cinnamon. Sprinkling this over each cheesecake gives it a crunchy, golden finish. The streusel melts slightly in the oven, creating that perfect apple crisp effect.
I bake the cheesecakes at 300ºF until the centers are just set, then let them cool in the pan for 15-20 minutes. After transferring to a wire rack to cool completely, I chill them in the fridge for 3-4 hours. This helps them firm up and makes them easier to serve.