This hearty stuffed squash is super low maintenance and extremely filling. F
Preheat oven to 400 degrees F. Grease a 12-inch cast-iron skillet. Place squash, cut side down, in prepared skillet. Cover with foil and bake until tender, 34 to 36 minutes. Remove to a plate; reserve skillet.
Heat oil in skillet over medium heat. Add leeks and cook, stirring occasionally until tender, 2 to 4 minutes. Stir in chard and garlic and cook, stirring, until wilted, 2 to 3 minutes. Stir in breadcrumbs, raisins, pine nuts, and Feta. Season with salt and pepper.
Fill squash with chard mixture, dividing evenly. Place squash, cut side up, in skillet and bake until tops are golden brown 15 to 20 minutes.