Preheat your oven to 325°F (160°C). Prepare a 9-inch springform pan by lightly greasing it. Wrap the outside of the springform pan tightly with two layers of heavy-duty aluminum foil to prevent water from seeping in during the water bath.

In a food processor, finely crush the Oreo cookies until they resemble fine crumbs. Alternatively, place them in a Ziploc bag and crush with a rolling pin. Transfer crumbs to a medium bowl.

Pour the melted butter over the Oreo crumbs and mix until well combined and the crumbs are moistened.

Press the mixture evenly into the bottom of the prepared springform pan. Bake for 8-10 minutes. Remove from oven and let cool slightly while you prepare the filling.

In a large mixing bowl with an electric mixer (stand or hand), beat the softened cream cheese on medium speed until smooth and creamy, scraping down the sides of the bowl as needed.

Gradually add the granulated sugar, beating until just combined and smooth. Do not overmix.

In a small bowl, whisk together the cocoa powder and flour, then add to the cream cheese mixture and beat on low speed until just incorporated.

Stir in the sour cream, vanilla extract, and red food coloring until evenly distributed and the batter has a uniform red color.

Add the eggs one at a time, beating on low speed only until each egg is just combined. Be careful not to overmix the batter once the eggs are added, as this can lead to cracks in the cheesecake.

Pour the red velvet cheesecake filling over the pre-baked Oreo crust in the springform pan. Gently tap the pan on the counter a few times to release any air bubbles.

Place the foil-wrapped springform pan into a larger roasting pan. Carefully pour hot water into the roasting pan until it comes about halfway up the sides of the springform pan.

Carefully transfer the roasting pan with the cheesecake to the preheated oven. Bake for 60-70 minutes, or until the edges are set but the center still jiggles slightly when gently shaken.

Turn off the oven, leave the cheesecake in the water bath, and prop the oven door open slightly. Let the cheesecake cool in the oven for 1 hour. This slow cooling helps prevent cracks.

Carefully remove the cheesecake from the water bath and remove the foil. Place it on a wire rack to cool completely at room temperature, about 1-2 hours. Once cool, cover and refrigerate for at least 6 hours, or preferably overnight, for best setting and flavor.

In a medium bowl, beat the softened cream cheese and butter with an electric mixer until smooth and creamy.

Gradually add the sifted powdered sugar, beating on low speed until incorporated, then increase speed to medium-high and beat until light and fluffy.

Stir in the vanilla extract. If the frosting is too thick, add milk or heavy cream 1 tablespoon at a time until desired consistency is reached.

Once the cheesecake is thoroughly chilled, carefully remove it from the springform pan. Spread the cream cheese frosting evenly over the top of the cheesecake.

Garnish with additional crushed Oreo cookies or chocolate shavings, if desired. Slice and serve cold.