Preheat your oven to 350°F (175°C) and line a cupcake tray with liners.
Whisk flour, baking powder, baking soda, and salt in a bowl.
Cream butter and sugar until light and fluffy; add eggs and vanilla.
Mix in sour cream and milk, then fold in dry ingredients.
Fill liners ⅔ full with batter and bake for 18–20 minutes. Let cool.
Mix chopped strawberries and jam for the filling.
Whip cream, powdered sugar, and vanilla until soft peaks form.
Core the cooled cupcakes, fill with strawberry mixture, and top with whipped cream.