Preheat oven to 375°F (190°C). Grease a 9”x 6” rectangular, 8” round, or any baking dish with 1- to 1 & 1/2-quart capacity.
Place the berries in the prepared pan. Drizzle with the lemon juice.
Whisk together the flour, baking powder, and salt. Set aside.
In a medium bowl, beat the butter, brown sugar, and vanilla until well-blended. Mix in the dry ingredients until the mixture resembles crumbs. Drop the dough evenly on top of berries.
Bake for 30 minutes, or until the top is lightly browned and the fruit is bubbly.
Notes
If you use any larger berries, such as strawberries, I recommend chopping them into blueberry-sized pieces.
For feeding a crowd, this recipe is easily doubled to be made in a 9”x 13” dish.
Cover leftover mixed berry cobbler with plastic wrap or place it in an airtight container. Store the leftovers in the refrigerator for up to 3-4 days. You can reheat it covered in a 350ºF oven or warm up individual portions in the microwave.