Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a medium mixing bowl, whisk together the dry ingredients: flour, baking soda, baking powder, and salt.

In a large mixing bowl, beat the butter and cream cheese until light and fluffy, then add the granulated and brown sugars, mixing until smooth.

Add in the egg and vanilla extract to the butter mixture and mix until fully incorporated.

Fold the dry ingredients into the wet mixture until just combined.

Gently fold in the blueberries and any optional add-ins, being careful not to crush the berries.

Scoop rounded tablespoons of dough onto the prepared baking sheet.

Bake in the preheated oven for 12-15 minutes until golden around the edges.

Remove from the oven and cool on the baking sheet for 5 minutes before transferring to a wire rack.