1. Crank your oven to 375°F and grease a 9×13 inch casserole dish generously. Don’t skip this or you’ll be scraping for days.
2. In a large skillet over medium heat, cook the ground turkey until it’s nicely browned, about 6-7 minutes. Break it up as it cooks so you don’t get giant chunks.
3. Add your diced onion and minced garlic to the skillet. Sauté everything together for about 3 minutes until the onion turns see-through and your kitchen smells amazing.
4. Toss in the celery leaves and cook for another 2 minutes until they wilt down. Let any moisture cook off before moving on.
5. Sprinkle the flour over the turkey mixture and stir constantly for about 1 minute. This needs to cook or your sauce will taste raw and pasty.
6. Gradually pour in the chicken broth and milk, stirring like your life depends on it until the mixture thickens up, maybe 2-3 minutes. Keep stirring to avoid lumps.
7. Add the grated Parmesan cheese and season with salt and pepper. Cook for an additional 2 minutes, stirring occasionally, until it’s thick enough to coat the back of your spoon.
8. Kill the heat and fold in the cooked rice until everything’s well combined and looking creamy.
9. Transfer the whole mixture to your greased casserole dish and spread it out nice and even. No need to be fancy about it.
10. Slide it into the preheated oven for 25-30 minutes until it’s bubbling around the edges and golden on top. Check it at 25 minutes because ovens vary.
11. Let it rest for about 5 minutes before serving. This gives it time to set up and makes it easier to serve without everything sliding around.

Nutrition Information (Per Serving):

• Calories: 285
• Carbohydrates: 28g
• Protein: 24g
• Fat: 8g
• Fiber: 2g
• Sodium: 420mg
• Calcium: 12% DV (thanks to that Parmesan and milk)
• Vitamin A: 15% DV (celery leaves are surprisingly nutritious)

This casserole provides lean protein from turkey and unexpected nutrients from celery leaves, which contain more vitamins than the stalks.

Notes:

• Seriously, grease that casserole dish well. Future you will be grateful.
• Stir constantly when adding the liquids or you’ll get lumps. Ask me how I know.
• Every oven runs differently, so check at 25 minutes and cover with foil if it’s browning too fast.
• Day-old rice actually works better than fresh because it’s drier and absorbs the sauce perfectly.
• Don’t use fat-free milk—it makes a watery, sad sauce that nobody wants.

Storage Tips:

Keep leftovers in an airtight container in the fridge for up to 4 days. This casserole reheats beautifully—either microwave individual portions for 2-3 minutes or reheat the whole thing in a 350°F oven for 15-20 minutes covered with foil. You can freeze this for up to 3 months, but the rice texture gets softer after freezing. Thaw overnight in the fridge before reheating. Don’t try to reheat from frozen or you’ll get an icy center and overcooked edges.

Serving Suggestions:

• Simple green salad: Something crisp and acidic balances the creamy richness
• Garlic bread: Perfect for soaking up any extra sauce
• Roasted vegetables: Broccoli or green beans add color and nutrition
• Cranberry sauce: A dollop on top adds sweet-tart contrast

Mix It Up (Recipe Variations):

Cheesy Deluxe Casserole: Add 1 cup shredded cheddar to the sauce and top with 1/2 cup panko breadcrumbs before baking for extra richness and crunch.

Mushroom and Herb Casserole: Sauté 1 cup sliced mushrooms with the onions and add 1 teaspoon fresh thyme for an earthy, sophisticated version.

Spicy Southwest Casserole: Add 1 can (4 oz) diced green chiles and swap Parmesan for pepper jack cheese for a kicked-up version with heat.

Gluten-Free Turkey Casserole: Replace flour with 2 tablespoons cornstarch and use gluten-free chicken broth. Works perfectly with no weird texture.

What Makes This Recipe Special:

This casserole embraces the zero-waste philosophy by featuring celery leaves, which contain higher concentrations of flavor compounds and nutrients than the stalks themselves. The classic roux-based sauce technique creates restaurant-quality creaminess without any cream, making it lighter than traditional casseroles while still being deeply satisfying. It’s practical comfort food that turns kitchen scraps into the star ingredient.