This zucchini breakfast casserole, starring cheese, bacon, sour cream, and, of course, fresh summer squash, is the kind of dish you eat once and then proceed to gush about forever. Everything you love about a summertime brunch spread — creamy eggs, chunks of zucchini, crunchy sourdough, crispy bacon — is piled into your cast iron skillet to create a veg-heavy meal you won't be able to get enough of.
Your New Favorite Way to Use Up Summer Zucchini
Come mid-summer when you're inundated with zucchini, you're likely in need of a new way to use it up — and that's exactly where this casserole comes into play. The thick slices of the bright-green squash do double duty in this dish by working an extra helping of veggies into your day while also balancing out the richness of the sour cream, bacon, and cheese.
While we typically recommend cooking summer squash before adding it into anything with an egg base (say, a frittata), you keep it raw in this recipe. The thick pieces hold their shape, softening just a bit without becoming mushy. The large pieces of toasty sourdough absorb the small amount of moisture released from the zucchini and act as a golden, crunchy topping.
A Fast and Easy Way to Dry Out Bread for Casseroles
Many stratas and egg casseroles will call for stale (or day-old) bread, which better absorbs the egg-y custard. But if you're working with a freshly baked loaf, you don't have to wait until tomorrow to get cooking. Instead, spread the bread cubes onto a rimmed baking sheet in an even layer. Toast, stirring halfway through, until the cubes feel dry and hard, but are still very pale, 15 to 20 minutes total. Remove from the oven and set aside to cool slightly.