Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.

In a mixing bowl, whisk together the flour, baking powder, sugar, and salt.

Cut in the cold butter using a pastry cutter until the mixture resembles coarse crumbs.

Pour in the heavy cream and mix until just combined.

Turn the dough onto a floured surface and gently knead it a few times.

Roll out the dough to about 1-inch thickness and cut into rounds.

Place half of the rounds on the prepared baking sheet, spoon a tablespoon of blueberry jam onto each, and top with the remaining rounds.

Bake in the preheated oven for 15-20 minutes or until golden brown.

Let cool slightly before serving.