Steps:
- Adjust an oven rack to lower-middle position and heat oven to 425 degrees.
- Whisk flour, baking powder, baking soda and salt together in a large bowl. In a separate bowl, whisk melted butter and butterniillc together. Gently stir buttermilk mixture into flour mixture with a rubber spatula until just combined and no pockets of flour remain.
Assembly
Pinch off 8 equal pieces of the biscuit dough and arrange them on top of the hot filling, spaced 1⁄4 inch apart. Bake until the biscuits are golden and the filling is bubbly, about 20 minutes. Cool for 5 to 10 minutes before serving.