Tomato Cobbler with Blue Cheese Biscuits

I love blue cheese, I am the only person in my house who will jump at it so I don't buy it often. I don't know what it is but I just...so good.
Our garden also has a lot of tomatoes. Whoever decided that it was easier to from them from small little plants instead of seeds may have been off their rocker. That orange strawberry plant I told you about is still not stopping and I can't keep up. The cherry tomatoes are just as nuts,  I might have to make some tomato jam in the next couple of days.
Due to my adoration of these two things my heart may have jumped a bit when I saw this Tomato Cobbler with Blue Cheese Biscuits Miss Joy made. I changed it up a bit to use what I had on hand but it was still freakin' good. I waited a whole year before making them because of the blue cheese, I refused to leave it out. This year one of the twins decided that she loves tomatoes so I had to make it for her. She really went for it biscuit and all.

Tomato Cobbler with Blue Cheese Biscuits
Slightly adapated from Joy the Baker

Serves 6

For the Biscuits:
2 cups all-purpose flour
2 tablespoons baking powder
1 tablespoon granulated sugar
1/2 teaspoon salt
1/2 teaspoon coarse ground black pepper
6 tablespoon unsalted butter, cold and cut into cubes
1/2 cup blue cheese crumbles
3/4 cup cold buttermilk

For the Filling:
2 tablespoons olive oil
1 tablespoon unsalted butter
2 large onions, sliced
3 cloves garlic, minced
2 tablespoons balsamic vinegar
2 pounds tomatoes
1/4 cup coarsely chopped basil (I actually used about 3 Tbs of thyme)
3 tablespoons all-purpose flour
1/2 teaspoon red pepper flakes
salt and coarsely ground black pepper

To make the Biscuits:
In a medium bowl, whisk together flour, baking powder, sugar, and salt, add cold butter. With your fingers, quickly break up the fat into the dry ingredients.  Rub the fats into the dry ingredients until well incorporated.  Some butter pieces will be the size of small peas, other will be the size of oat flakes.  Toss in blue cheese crumbles.  Stir to incorporate.
Create a small well in the center of the flour mixture.  Add buttermilk all at once.  With a fork, quickly bring together the wet and dry ingredients.  The dough will be rather shaggy.  Dump dough out onto a lightly floured work surface.  Knead dough about 10 times, bringing it together into a disk.  Wrap dough in plastic wrap and refrigerate until the filling is assembled.

To make the tomato Filling:
Add olive oil and butter to a medium saute pan over medium heat.  Add sliced onions and season with salt and pepper.  Cook and brown onions, stirring occasionally, until caramelized, about 18 to 20 minutes.  Add garlic and cook for one minute more.   Remove pan from heat, add balsamic vinegar and set aside.
In a large bowl, toss together tomatoes, chopped basil, flour, and red pepper flakes.  Add caramelized onions and toss together until everything is lightly and evenly coated in flour. Season with salt and pepper.
Place rack in the upper third of the oven and preheat oven to 375 degrees F.
Pour the tomato and onion filling into a square 8×8-inch baking dish.  Place in the oven and bake tomatoes filling for 25 minutes.
Remove the biscuit dough from the fridge.  On a lightly floured work surface, roll out biscuit dough into a 3/4 or 1-inch thickness.  Use a 1 1/2 to 2-inch round biscuit cutter to cut out biscuits.  Dip the cutter in flour should it get sticky.  Remove the partially cooked filling from the oven and carefully place 6 biscuits atop the tomato filling in the pan.  Brush biscuit tops with buttermilk and sprinkle with salt and pepper.  Reshape and reroll excess biscuit dough to make extra biscuits at another time.  (The shaped biscuit dough freezes very well.)
Return warm filling and biscuit dough to oven and bake for 17-20 minutes, until the biscuits are golden brown and cooked through, and the tomato mixture is bubbling.
Remove from the oven and allow to cool for about 15 minutes before serving.  Tomato Cobbler is best served warm