Preheat oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners.
Beat softened cream cheese with sugar until smooth. Mix in egg and vanilla until creamy. Set aside.
Whisk flour, cocoa powder, baking soda, and salt. In another bowl, mix oil and sugar, then add egg, buttermilk, vanilla, vinegar, and red food coloring. Combine wet and dry ingredients just until mixed—don’t overmix.
Spoon 1 tbsp of batter into each liner. Add 1 tsp cheesecake filling, then top with more batter until ¾ full.
Bake 18–22 minutes, until tops spring back and a toothpick (inserted off-center) comes out clean. Cool completely.
Frost with cream cheese or buttercream. Drizzle with strawberry glaze or jam, then top with half a strawberry.