Preheat your oven to 350°F (175°C). Grease the baking pan or line with parchment paper for easier removal.
In a mixing bowl, cream together the softened butter and granulated sugar until light and fluffy using a whisk.
Add in the eggs and vanilla extract, mixing well until combined.
In a separate bowl, whisk together the flour, salt, and baking powder. Gradually add this dry mixture to the wet ingredients and stir until just combined.
Gently fold in the cranberries, taking care not to crush them.
Pour the batter into the prepared baking pan and spread it evenly.
Bake in the preheated oven for about 30 minutes, or until a toothpick inserted in the center comes out clean.
Let the bars cool in the pan for at least 10 minutes before transferring them to a wire rack to cool completely.
Once cooled, you may dust the top with powdered sugar for an added touch.