Dinner

Cheesy Mashed Potato Broccoli Casserole Recipe

Name: Cheesy Mashed Potato Broccoli Casserole Recipe
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Cuisine: American
Ingredients: 12 ounces broccoli florets, chopped into small pieces (about 340 grams or a medium-sized head); 6 small-medium Yukon Gold potatoes, peeled and chopped (approximately 1200 grams or 2.5 pounds); 3 cloves garlic, minced; 1/4 cup chopped parsley; 1/4 cup chopped green onion; 2 Tbsp olive oil; 1/4 cup butter; 1/2 cup milk; 7 ounces shredded cheddar cheese (about 200 grams or just over 2 cups); Salt and pepper, to taste

ByMatteo Rossi November 8, 2025November 8, 2025

Jump to Recipe

Introduction

This Cheesy Mashed Potato Broccoli Casserole is a comforting, easy side dish that combines creamy mashed potatoes with tender roasted broccoli and melted cheddar cheese. Perfect for family dinners or potlucks, it brings together simple ingredients for a flavorful and satisfying meal addition.

The image shows a close-up of a baked casserole in a white rectangular dish, featuring a creamy mixture with chunks of broccoli spread throughout. The top layer is golden melted cheese, sprinkled with black pepper and small green onion slices, giving a mix of yellow-orange, green, and white colors. The texture looks soft and slightly crispy on the edges, with a metal serving spoon scooping out a portion from the bottom right corner, exposing the creamy mashed layer underneath with broccoli pieces. The dish is set on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

Ingredients

12 ounces broccoli florets, chopped into small pieces (about 340 grams or a medium-sized head)
2 tablespoons olive oil
6 small to medium Yukon Gold potatoes, peeled and chopped (roughly 1200 grams or 2.5 pounds)
1/4 cup butter
1/2 cup milk
3 cloves garlic, minced
1/4 cup chopped parsley
1/4 cup chopped green onion
7 ounces shredded cheddar cheese (about 200 grams or just over 2 cups)
Salt and pepper, to taste

Instructions

Step 1: Preheat your oven to 375°F (190°C). While the oven heats, prepare the potatoes, broccoli, garlic, and herbs as described.
Step 2: Place the chopped potatoes in a large pot. Cover them with water and a lid, then bring to a boil. Once boiling, reduce the heat and let the potatoes simmer, covered, for about 15 minutes or until they are fork-tender.
Step 3: Spread the chopped broccoli in a large casserole or baking dish. Drizzle with olive oil, season with salt and pepper, and toss to coat. Arrange the broccoli in a single layer and bake in the oven for 15 minutes. Remove from the oven once done.
Step 4: Drain the potatoes and return them to the pot. Add the butter, milk, minced garlic, salt, and pepper. Mash the mixture until smooth and creamy. Then, stir in the chopped parsley and green onions. Taste and adjust seasonings as needed.
Step 5: Add the mashed potatoes to the casserole dish with the roasted broccoli. Mix well to combine, then spread the mixture evenly. Sprinkle half of the shredded cheddar cheese over the top, then add the remaining cheese as a final layer.
Step 6: Return the casserole to the oven and bake for 15 to 20 minutes, or until the cheese is fully melted and bubbly. Serve the casserole hot.

Tips & Variations

For extra creaminess, substitute half-and-half or cream for the milk.
Add cooked bacon or ham for a meaty twist.
Swap cheddar cheese with Monterey Jack or mozzarella for a different flavor profile.
For a lighter version, use Greek yogurt in place of some butter and milk.
Make ahead by preparing the casserole up to step 5, then refrigerate and bake before serving.

Storage

Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, cover the casserole with foil and warm in a 350°F (175°C) oven until heated through, about 15 minutes. You can also microwave individual portions, stirring halfway to heat evenly.

How to Serve

A white rectangular baking dish filled with a broccoli and cheese casserole, showing one layer of tender green broccoli florets mixed throughout a creamy, pale yellow mashed base, topped with melted golden-yellow cheddar cheese and white cheese that is slightly browned at the edges, garnished with sliced green onions scattered on top. The dish sits on a white marbled surface with some broccoli florets, two light yellow potatoes, and a bowl with more sliced green onions nearby, creating a fresh and homey feel. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use frozen broccoli instead of fresh?

Yes, frozen broccoli works well. Thaw and drain it first to prevent extra moisture, then roast as directed.

Can I make this casserole vegan?

To make it vegan, use plant-based butter, milk alternatives, and dairy-free cheese substitutes. The flavor will be slightly different but still delicious.