Main Dishesbonappetit5.0
Yellow Squash Casserole
This creamy summer squash casserole recipe has a buttery, crushed cracker topping and an easy, cheesy cheddar-Parmesan cream sauce.
👥 8 Servings👤 Kelly Janke📖 bonappetit
🥘 Ingredients
Check off ingredients as you prepare them:
🍳 Cookware
- ●skillet
- ●baking dish
- ●bowl
- ●oven
📝 Preparation Steps
1
Preheat oven to 375°. Grease a 13x9" baking dish with unsalted butter. Melt 1 Tbsp. unsalted butter in a large skillet over medium-high heat. Working in 2 batches and adding 1 Tbsp. unsalted butter between batches, cook 3 lb. yellow summer squash, sliced crosswise ¼" thick, tossing often, until softened and golden brown, 8–⏱️ 10 minutes. Season each batch with 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt and transfer to a large bowl.
. unsalted butter, divided, plus more for greasing dish6 Tbsp. yellow summer squash (5–6 medium), sliced crosswise ¼" thick3 lb
2
Melt 1 Tbsp. unsalted butter in same skillet. Add 1 medium onion, finely chopped, and ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt. Cook, stirring often, until onion is softened and golden brown, about ⏱️ 5 minutes. Reduce heat to low and pour in ¾ cup heavy cream; stir to combine. Bring to a gentle simmer, then remove from heat and stir in ½ cup sour cream and ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt.
. unsalted butter, divided, plus more for greasing dish6 Tbspmedium onion, finely chopped1
3
Add mixture to bowl with squash, then add 4 oz. sharp white cheddar, grated (about 1 cup), ⅓ cup finely grated Parmesan, 1 Tbsp. thyme leaves, and ½ tsp. freshly ground black pepper; stir gently to combine. Transfer to prepared baking dish and spread into an even layer. Wipe and reserve skillet.
. sharp white cheddar, grated (about 1 cup)4 oz. thyme leaves, plus more for serving1 Tbsp
4
Using your hands, crush 1 sleeve Ritz crackers or other buttery crackers into coarse crumbs in a medium bowl. Melt remaining 3 Tbsp. unsalted butter in reserved skillet over medium heat. Stir in remaining ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt until dissolved, then pour over cracker crumbs. Sprinkle remaining ⅓ cup finely grated Parmesan over and toss to combine. Scatter cracker mixture evenly over casserole.
. unsalted butter, divided, plus more for greasing dish6 Tbsp
5
Bake casserole until golden brown on top and bubbling, 35–⏱️ 40 minutes. Top with zest of 1 lemon and more thyme leaves. Let cool ⏱️ 5 minutes before serving.
Zest of 1 lemon
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