Step 1: Stir together the all the ingredients (except the noodles, butter, and breadcrumbs) in a 3-quart casserole dish until totally combined.
Step 2: Submerge the noodles into this mixture and press down on them with the back of a rubber spatula to make sure they are as submerged as possible.
Step 3: Cover the dish tightly with foil or an oven-safe lid and bake the jackfruit casserole at 400F for 40 minutes.
Step 4: While the casserole bakes, stir together the melted vegan butter and bread crumbs. This will be our topping!
Step 5: After 40 minutes, remove the jackfruit noodles from the oven, remove the cover, and stir it completely.
Step 6: Top with the bread crumb mix. Bake another 5-10 minutes, uncovered, until topping is lightly browned.
Let the vegan tuna noodle casserole sit 10 minutes uncovered before serving and enjoying!