12 Summer Casserole Recipes You'll Want to Make Forever

Easy-peasy summery bakes.

By
Devan Grimsrud
Devan Grimsrud
Devan Grimsrud

Devan Grimsrud is a Berlin-based writer, editor, and recipe developer originally from Minneapolis, Minnesota. After working in television production with James Beard Award-winning chef Andrew Zimmern, she relocated to Berlin and became the managing editor at Kitchen Stories, an international digital cooking platform with millions of active users. 

Learn about Simply Recipes' Editorial Process
Published June 08, 2025
Devan Grimsrud
Walking taco casserole with dollops of sour cream in a casserole dish with a serving spoon (casserole dish missing some casserole)

Simply Recipes / Karishma Pradhan

These veg-packed recipes prove casseroles aren't just for the colder months. Bake them off and serve them at any summer party, from backyard barbecues to poolside picnics. Scrolling through these 12 summery casseroles, you'll find helpful tips and tricks from our readers, editors, and contributors. Enjoy!

  • Zucchini, Eggplant, Tomato Gratin

    Zucchini Eggplant Tomato Gratin
    Elise Bauer

    "The zucchini, eggplant, and tomato in this recipe need to be sliced into 1/4-inch rounds. A mandolin will make short work of slicing the eggplant and tomato evenly and quickly. You can also use a food processor with a slicing disc."—Elise Bauer, Simply Recipes Founder

  • Broccoli Cheese Casserole

    Broccoli Cheese Casserole - an easy broccoli casserole you'll love!
    Elise Bauer

    "It was just exactly what I was looking for to make a “broccoli-forward” dish. I grated 1/2 a fresh onion into the egg mixture along with fresh garlic and used a generous amount of chopped, fried smoked turkey bacon. Excellent! The fresh broccoli I used came out with perfect texture."—Lina, Simply Recipes Reader

  • Zucchini Noodle Casserole

    Zucchini Noodle Casserole in a Casserole Dish with Some on a Spatula

    Simply Recipes / Michelle Becker

    "The main complaint that people have when cooking with zucchini noodles is that they end up mushy. My approach to how to deal with this is to salt the zucchini noodles well and let them drain of their excess moisture."—Elise

  • Denver Omelette Hashbrown Casserole

    Slice of Denver omelette hashbrown casserole lifted from a casserole dish, and in the surroundings, a stack of plates and a mug

    Simply Recipes / Photo by Fred Hardy / Food Styling by Jennifer Wendorf / Prop Styling by Lindsey Lower

    "You can assemble it ahead of time or throw it together right before serving. It’s a great way to use up some leftover ham, so bust it out for a special breakfast the day after a big holiday meal–or make it on a weeknight since it’s easy and so, so satisfying."—Sara Bir, Former Simply Recipes Senior Editor

    Continue to 5 of 12 below

  • Chile Relleno Casserole

    An uncut chili relleno casserole on a white background
    Cambrea Bakes

    "You can easily omit the meat from this recipe to make a vegetarian chile relleno casserole. Add black beans, vegetarian/vegan chorizo, spicy potatoes, and/or sautéed vegetables in place of the meat, if you'd like."—Simply Recipes Editors

  • Walking Taco Casserole

    Walking taco casserole in a casserole dish with a spoon (casserole dish missing some casserole / some of the casserole was already served)

    Simply Recipes / Karishma Pradhan

    "For a milder version, replace the Rotel with plain canned diced tomatoes (without chiles)."—Karishma Pradhan, Recipe Developer

  • Creamy Baked Mac and Cheese

    Kraft mac and cheese - woman's hands holding a white casserole dish filled with baked mac and cheese
    Alison Bickle

    "I prefer to shred my own cheese for this recipe. From what I’ve read, pre-shredded cheese is less smooth because anti-caking agents are added. If you’re in a hurry, go for the pre-shredded, but if you have time, shredding the cheese yourself will make this dish that much better!"—Summer Miller, Recipe Developer

  • Easy Burrito Casserole

    Baked burrito casserole with lettuce and tomatoes.

    Simply Recipes / Wanda Abraham

    "You can use corn tortillas instead of flour tortillas for more nutty corn flavor."—Wanda Abraham, Simply Recipes Visual Editor

    Continue to 9 of 12 below

  • Grandma’s Corn Pudding

    Corn pudding in a casserole dish (with a bit already spooned out from the corner) next to a table napkin

    Simply Recipes / Sarah Crowder

    "I have been making something similar to this for a few decades. My grandmother's recipe called for sweetened condensed milk AND sugar. I use regular milk and half of the sugar she did. Toss in some feta for a nice contrast or go for chopped jalapenos for some kick."—Saveena, Simply Recipes Reader

  • Fennel Gratin

    Fennel Gratin in an Oval Shaped Cast Iron Skillet

    Simply Recipes / Elise Bauer

    "In my family, we gratin it with béchamel and lots of parm after boiling for seven minutes like in this recipe. It is a valid alternative for those who do not fancy mozzarella, if there are any!."—Rossella, Simply Recipes Reader

  • Easy Breakfast Casserole

    Breakfast Casserole
    Elise Bauer

    "You can add cooked, sturdy veggies such as broccoli into the casserole, or put them in raw. If using raw veggies, cut them into smaller pieces and know that they'll be crunchier if you put them in raw instead of cooked."—Elise

  • Zucchini and Spinach Gratin

    Zucchini Spinach Gratin
    Elise Bauer

    "If you prefer to use fresh spinach over frozen, use six packed cups of fresh chopped spinach leaves, blanched and drained."—Elise

Explore More: