Preheat oven to 400°F.
Prepare a 9×13 baking dish.
In a large pot, sauté onion, carrots, celery, and garlic in a splash of broth until softened.
Add shredded jackfruit and cook 4–5 minutes until it starts to break apart.
Add 1 cup whole beans, 1 cup mashed beans, peas, vinegar, and all seasonings.
Pour in 3 cups vegetable broth.
Whisk together 3 Tbsp oat flour + ½ cup soy milk to create a smooth slurry. Stir slurry into the pot.
Simmer 5–8 minutes until thick, creamy, and stew-like.
Taste and adjust seasoning.
Pour into your baking dish.
Make the biscuit topping from the Southern Style Biscuit recipe and drop dough on top of filling.
Bake 25–30 minutes until biscuits are golden and the filling is bubbling around the edges.
Let rest 10 minutes before serving for perfect thickness.