Combine shredded tofu, carrots, celery, onion, garlic, broth, plant milk, nutritional yeast, thyme, and sage in slow cooker.
Season with salt and pepper, stir well, and cover. Cook on low for 3 hours.
Prepare dumplings by whisking flour, baking powder, salt in a bowl.
Mix plant milk and melted vegan butter, then combine with dry ingredients to form thick batter.
Spoon dumpling batter gently over stew surface, cover again.
Cook another 1 hour on low until dumplings are fluffy and cooked through.
Serve hot and enjoy that cozy, no-fuss comfort on a plate.