Combine graham cracker crumbs and melted butter in a bowl until evenly coated, then press the mixture into the bottom of a springform pan to form an even crust. Chill in the refrigerator for 15 minutes to set.
In a large mixing bowl, beat the softened cream cheese and sugar with an electric mixer until smooth and creamy, about 2-3 minutes. The mixture should be free of lumps and slightly fluffy.
Add eggs one at a time, beating gently after each addition to incorporate completely, which helps build a smooth, cohesive batter.
Mix in the cocoa powder and vanilla extract until fully combined, giving the batter a deep, chocolate color and rich aroma.
Pour the cream cheese batter over the chilled crust and smooth the top with a spatula for an even surface. Place the pan in a preheated oven at 160°C (320°F) and bake for about 60 minutes, until the edges are set but the center still slightly jiggles.
Remove the cheesecake from the oven and let it cool completely on a wire rack. Once cooled, refrigerate for at least 4 hours or overnight to fully set.
While the cheesecake is chilling, prepare the strawberry topping by tossing sliced strawberries with sugar in a bowl. Let them macerate for about 15 minutes until juicy and fragrant.
Arrange the macerated strawberries evenly on top of the chilled cheesecake. Lightly press them into the surface for a plush, inviting look.
Slice into pieces and serve immediately, enjoying the contrast of creamy filling, rich cocoa, and fresh, sweet strawberries.