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Prep Time: 20 minutes
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Cook Time: 35 minutes
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Total Time: 55 minutes
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Difficulty & Intensity Level: Easy to Intermediate (Level 2/5)
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Yield / Servings: 6 generous servings
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Cuisine: American / Comfort Food
Ingredients
For the Vegetable Medley:
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Broccoli: 4 cups fresh broccoli florets, cut into bite-sized pieces
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Zucchini: 1 medium zucchini, diced
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Yellow Squash: 1 medium summer squash, diced
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Bell Pepper: 1 large red bell pepper, chopped
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Red Onion: 1 medium red onion, sliced into half-moons
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Carrots: 2 medium carrots, thinly sliced
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Olive Oil: 2 tablespoons extra-virgin olive oil
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Garlic: 3 cloves, minced
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Seasonings: 1 teaspoon Italian seasoning, ½ teaspoon garlic powder, ½ teaspoon onion powder, ½ teaspoon sea salt, and ¼ teaspoon freshly cracked black pepper
For the Creamy Cheese Sauce:
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Butter: 2 tablespoons unsalted butter
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Flour: 2 tablespoons all-purpose flour (or gluten-free 1:1 baking flour)
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Milk: 1 ½ cups whole milk or unsweetened almond milk
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Vegetable Broth: ½ cup low-sodium vegetable broth
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Sharp Cheddar Cheese: 1 ½ cups, freshly shredded (divided)
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Mozzarella Cheese: ½ cup, freshly shredded
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Parmesan Cheese: ¼ cup, finely grated
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Dijon Mustard: 1 teaspoon (adds a subtle, tangy depth of flavor)
For the Golden Breadcrumb Topping:
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Panko Breadcrumbs: ½ cup
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Melted Butter: 1 tablespoon
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Fresh Parsley: 1 tablespoon, finely chopped
Cooking Process, Times, and Intensities
| Stage | Step / Action | Heat / Intensity Level | Duration |
| Stage 1 |
Oven Preheating & Preparation Preheat your oven to 400°F (200°C). Grease a 9×13-inch baking dish with non-stick spray or butter. |
High Heat (400°F / 200°C) | 10 minutes |
| Stage 2 |
Blanching the Broccoli & Carrots Bring a large pot of salted water to a rolling boil. Add broccoli florets and sliced carrots. Cook until bright green and slightly tender. Drain immediately and transfer to an ice bath to stop cooking. Drain well. |
High Heat (Boiling water) | 3 minutes |
| Stage 3 |
Sautéing Aromatics & Vegetables Heat 2 tablespoons of olive oil in a skillet. Add onions, red bell pepper, zucchini, and yellow squash. Sauté until lightly softened. Stir in minced garlic and seasonings right at the end. |
Medium-High Heat | 5 – 7 minutes |
| Stage 4 |
Preparing the Cream Roux & Sauce Melt butter in a saucepan over medium heat. Whisk in flour and cook for 1 minute until bubbly. Slowly pour in milk and broth while whisking continuously until smooth and thickened. Stir in Dijon mustard, 1 cup Cheddar, and ½ cup Mozzarella until fully melted. |
Medium to Low Heat | 6 – 8 minutes |
| Stage 5 |
Assembly Combine blanched broccoli/carrots and sautéed vegetables in the prepared baking dish. Pour the rich cheese sauce evenly over the top and gently toss to coat. Top with remaining ½ cup Cheddar, Parmesan, and buttered Panko breadcrumbs. |
N/A (Prep Stage) | 5 minutes |
| Stage 6 |
Baking to Perfection Bake uncovered until the cheese is hot, bubbly, and the top turns a golden brown. |
Medium-High Heat (375°F / 190°C) | 20 – 25 minutes |
| Stage 7 |
Resting & Finishing Remove from the oven. Let the casserole cool and set slightly before serving. Garnish with fresh chopped parsley. |
Room Temperature | 5 – 10 minutes |
Step-by-Step Instructions
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Preheat and Prepare: Set your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish and set it aside.
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Blanch Hard Vegetables: In a large pot of boiling water, blanch the broccoli florets and sliced carrots for 2–3 minutes until bright and tender-crisp. Drain and plunge into cold water to lock in color and texture. Pat dry thoroughly.
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Sauté the Medley: In a large skillet over medium-high heat, add olive oil. Sauté onions, bell pepper, zucchini, and squash for 5 minutes. Add garlic, Italian seasoning, garlic powder, onion powder, salt, and pepper; sauté for 1 more minute until fragrant.
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Build the Sauce: In a saucepan over medium heat, melt 2 tablespoons of butter. Whisk in flour and stir constantly for 60 seconds. Gradually whisk in milk and vegetable broth. Cook for 4–5 minutes until the sauce thickens and coats the back of a spoon. Lower heat and stir in Dijon mustard, 1 cup of Cheddar, and ½ cup of Mozzarella until silky smooth.
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Assemble the Casserole: Transfer all cooked vegetables into your prepared baking dish. Pour the cheese sauce evenly over the top, tossing gently to ensure every piece is coated.
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Add the Topping: Sprinkle the remaining ½ cup Cheddar cheese and ¼ cup Parmesan over the casserole. Toss Panko breadcrumbs with 1 tablespoon melted butter and sprinkle across the top.
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Bake: Reduce oven temperature to 375°F (190°C) and bake for 20 to 25 minutes until golden brown and bubbly around the edges.
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Rest and Serve: Allow the dish to cool for 5–10 minutes so the sauce sets nicely before serving. Garnish with chopped fresh parsley.
Storage, Reheating & Meal Prep Guidelines
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Refrigeration: Store leftover casserole in an airtight container in the refrigerator for up to 4 days.
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Freezing: Assemble the casserole completely (without the breadcrumb topping), wrap tightly with plastic wrap and aluminum foil, and freeze for up to 2 months. Thaw overnight in the refrigerator before baking.
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Reheating: Reheat individual portions in the microwave for 1.5 to 2 minutes, or heat the entire dish in a 350°F (175°C) oven for 15–20 minutes until warmed through and crisp on top.
Complete Nutritional Breakdown
The following values represent estimated nutritional facts per serving (based on 6 total servings).
| Nutrient | Amount Per Serving | % Daily Value* |
| Calories | 285 kcal | — |
| Total Fat | 18 g | 23% |
| Saturated Fat | 9.5 g | 48% |
| Trans Fat | 0.3 g | — |
| Cholesterol | 45 mg | 15% |
| Sodium | 480 mg | 21% |
| Total Carbohydrate | 19 g | 7% |
| Dietary Fiber | 4.5 g | 16% |
| Total Sugars | 5.5 g | — |
| Protein | 13 g | 26% |
| Vitamin D | 0.8 mcg | 4% |
| Calcium | 340 mg | 26% |
| Iron | 1.8 mg | 10% |
| Potassium | 520 mg | 11% |