Preheat the oven to 350°F. Crush the Oreos finely using a food processor or rolling pin, then mix with melted butter. Press into a parchment-lined pan and bake 8–10 minutes, then let it cool.
Beat softened cream cheese until smooth, then add sugar, sour cream, heavy cream, lemon juice, vanilla, and salt. Incorporate the egg gently and pour over the baked crust.
Cook chopped strawberries with sugar, lemon juice, and water until tender. Blend to a smooth puree, then mix with cream cheese, sugar, sour cream, vanilla, egg, and salt. Pour over the first cheesecake layer.
Place the 8×8 pan in a larger 9×13 pan with 2 inches of boiling water. Bake at 325°F for 30–35 minutes until the edges are set but the center jiggles slightly. Cool in the oven, then refrigerate for at least 6 hours.
Pulse Oreos and freeze-dried strawberries in a food processor. Mix with melted butter and a pinch of salt, then set aside to top the bars later.
Beat cream cheese and powdered sugar until smooth. Gradually add cold heavy cream and vanilla, mixing until medium peaks form. Spread over chilled bars before adding the crunch topping.
Remove cheesecake from the pan, add whipped cream, then sprinkle the strawberry crunch generously. Chill for 1–2 hours if desired, or serve immediately.