Herb-Infused Roasted Root Vegetable Casserole
A vibrant medley of sun-ripened root vegetables baked with fresh thyme and Gruyere, creating a golden, savory dish that captures the warmth of summer sunlight. This french-inspired vegetarian ready in about 70 minutes pairs sliced into 1/2-inch coins carrots, sliced into 1/2-inch coins parsnips, thinly sliced onions for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 315 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 2 cups, sliced into 1/2-inch coins carrots
- 2 cups, sliced into 1/2-inch coins parsnips
- 1 cup, thinly sliced onions
- 1 tbsp, fresh leaves thyme
- 1 cup, grated Gruyere cheese
- 3 tbsp butter
- 1/4 cup all-purpose flour
- 2 cups, whole milk
- 1/2 tsp salt
- 1/4 tsp black pepper
- 1/4 cup breadcrumbs
Instructions
- Step 1: Preheat oven to 375°F (190°C). In a large bowl, combine 2 cups sliced carrots, 2 cups sliced parsnips, and 1 cup thinly sliced onions. Toss with 1/2 tsp salt and 1/4 tsp black pepper until evenly coated.
- Step 2: Melt 3 tbsp butter in a medium saucepan over medium heat. Whisk in 1/4 cup all-purpose flour and cook for 1 minute until golden. Gradually whisk in 2 cups whole milk and simmer for 5 minutes until thickened, stirring constantly.
- Step 3: Stir 1 tbsp fresh thyme leaves into the sauce. Pour the sauce over the vegetables in the bowl and toss until fully coated.
- Step 4: Transfer the mixture to a greased 9x13-inch baking dish. Sprinkle 1 cup grated Gruyere cheese evenly over the top. Mix 1/4 cup breadcrumbs with 1 tbsp melted butter and sprinkle over the cheese.
- Step 5: Bake uncovered for 40 minutes until the top is golden brown and vegetables are tender when pierced with a fork. Rest for 10 minutes before serving.
Frequently asked questions
How long does Herb-Infused Roasted Root Vegetable Casserole take to make?
Total time is about 70 minutes (25 min prep + 45 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Herb-Infused Roasted Root Vegetable Casserole?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep thinly sliced onions from drying out.
Can I substitute ingredients in Herb-Infused Roasted Root Vegetable Casserole?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Herb-Infused Roasted Root Vegetable Casserole for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Herb-Infused Roasted Root Vegetable Casserole?
French vegetarian like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★★
A fantastic vegetarian dish that's easy to make. The root vegetables roasted perfectly with the herb infusion.
- ★★★★★
Loved the depth of flavor. Roasted root vegetables with herbs are a perfect side dish for any meal.
- ★★★★★
This casserole was a hit at my dinner party! The herbs really enhanced the natural sweetness of the vegetables.
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