Squash Casserole (au Gratin Style)

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A very easy side, this Squash Casserole comes together quickly while you cook other things! Decadent, creamy and garlicky – this will be the star of any dinner!

Simple dinners are my all-time favorite. Growing up in New Zealand, it was “meat & 3 vegetable” type meals. Typically – it’s meat, starch, a green vegetable and another vegetable of your choice (whatever is in season, really), and meat is considered the main event.

While I love a good casserole or bowl-of-soup-and-crusty-bread as a meal, I often return to this old standby of a combination when making dinner on the fly (although I did leave off the starch for this meal – it totally doesn’t need it!)

This Squash au Gratin was born from wanting a quick dinner, but nothing too crazy time-intensive (under 20 minutes). I had some chicken breasts, some green beans, and plenty of squash. Ta-da!

WHAT IS AU GRATIN?
The “Au Gratin” in the name simply means “a dish with a light browned crust of breadcrumbs or melted cheese”… so, basically, food of my dreams!

Cream, roasted garlic, fresh thyme and panko crumbs play important roles – taking it from your run of the mill sautéed summer squash, to “forget the chicken, gimme more of the veggies” I really am all about the side dishes!

To be clear, this is NOT exactly diet food. But we’re coming up to the holidays, so… you know…. let’s let this one slide. Like Julia Child says “If you’re afraid of butter, use cream”

I love that woman.

ABOUT THE SKILLET

Use any skillet that can go from stovetop to oven, no lid is needed. It does take some effort to get it out of the skillet in a pretty way, but if your family is like mine – they won’t care. And if you’re not a food blogger who needs to take pics, you shouldn’t either!

If your skillet isn’t ovenproof – no worries! Just cook in a regular skillet, then remove to a casserole dish or small baking dish (lightly greased) before topping.

How to make Squash Casserole

Full, printable recipe below – just scroll down to the recipe card!

PREPARE THE TOPPING

• Combine topping ingredients and set aside.

FOR THE VEGETABLES

1. Preheat the oven to 450F.
2. Heat a large skillet over medium heat, and add the tablespoons of butter, and melt.
3. Add the zucchini to the pan, season with salt and pepper and sauté for 3 minutes.
4. Add the chopped roasted garlic to the pan with the squash mixture, stir together, and cook for 1 min.
5. Pour the heavy cream into the pan, and stir together with the vegetables.
6. Bring to a simmer, and cook for 2 mins, or until the cream has reduced slightly.
7. Remove skillet from heat, and sprinkle the topping over the vegetables evenly.
8. Place skillet in the oven, cook for 4 mins, then switch to broil – and cook until the top is golden brown.
9. Remove skillet from oven, and let stand for 5-8 minutes, then serve.
10. Devour.

FAQs and Kylee’s Notes

• Roast your garlic! Go here for how to roast garlic. Fresh garlic will not taste the same – don’t sub!
• Do let it simmer gently, and don’t worry about how liquid-y it still is when you put it in the oven. Magic will happen. Promise.
• Let it stand/rest after removing from the oven – this will help it to set, and be easy to scoop.
• Use cream (no substitutes!) for the sauce.
• Sub dried thyme in the gratin instead of fresh if you don’t have it.
• Sub ritz crackers or another type of cracker crumbs if you don’t have panko breadcrumbs 

• More sides ideas? I got you!
  • Creamy Garlic Parmesan Risotto –  Risotto in 17-25 minutes?! I’m in! 
  • Pan Roasted Brussels Sprouts – Roasted Brussels sprouts, paired with delicate shallots, salty bacon and a bit of parmesan – YES PLEASE
  • Easy Scalloped Potatoes – there’s a video on this one, showing how EASY this is to make!
  • ALL SIDES

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Squash Casserole (Au Gratin Style)

A very easy side, this Squash Casserole (au gratin style) comes together quickly while you cook other things! Decadent, creamy and garlicky – this will be the star of any dinner!

5 from 1 vote

Print Pin Rate

Course: Side

Cuisine: American, French

Prep Time: 5 minutes

Cook Time: 10 minutes

Total Time: 15 minutes

Servings: 4 servings

Calories: 306kcal

Author: Kylee Cooks

Ingredients

For the topping

• 1/2 cup panko breadcrumbs
• 1 tsp garlic powder
• 1 Tbs fresh thyme (finely minced) or ¼ tsp dried thyme
• 1/8 tsp salt
• 1/8 tsp pepper
• ¼ cup shredded parmesan cheese

For the vegetables

• 2 Tbs butter
• 2 medium zucchini squash green or yellow, or 1 of each – about 12oz – cut into ¼ inch slices
• 1/8 tsp salt
• 1/8 tsp pepper
• 4 roasted garlic cloves roughly chopped
• 8 oz heavy whipping cream

Instructions

Prepare the topping

• Combine topping ingredients and set aside.

For the vegetables

• Preheat the oven to 450F.
• Heat a large skillet over medium heat, and add the tablespoons of butter, and melt.
  
• Add the sliced squash to the pan, season with salt and pepper and sauté for 3 minutes.
• Add the chopped roasted garlic to the pan with the squash, stir together, and cook for 1 min.
• Pour the heavy cream into the pan, and stir together with the vegetables.
• Bring to a simmer, and cook for 2 mins, or until the cream has reduced slightly.
• Remove skillet from heat, and sprinkle the topping over the vegetables evenly.
• Place skillet in the oven, cook for 4 mins, then switch to broil – and cook until the top is golden brown.
• Remove skillet from oven, and let stand for 5-8 minutes, then serve.
• Devour.

Nutrition

Calories: 306kcal | Carbohydrates: 12g | Protein: 6g | Fat: 26g | Saturated Fat: 14g | Cholesterol: 81mg | Sodium: 330mg | Potassium: 344mg | Fiber: 1g | Sugar: 3g | Vitamin A: 1160IU | Vitamin C: 21.6mg | Calcium: 153mg | Iron: 1.1mg

Tried this recipe?Mention @kyleecooks or tag #kyleecooks!

Tips for All Recipes on Kylee Cooks

Want to scale a recipe up or down? Simply click on the serving amount and move the slider up or down – the recipe will automatically adjust!

I always use salted butter in my recipes.

Always use a thermometer to test for doneness when cooking meat.

When a recipe is made in the oven, it should be pre-heated to the temperature in the recipe, unless otherwise noted.