Caramelized Onion Spinach Feta Savory French Toast Casserole

Name: Caramelized Onion Spinach Feta Savory French Toast Casserole
Prep time: 10 min
Cook time: 1 h 25 min
Total time: 1 h 35 min
Cuisine: European, American, Mediterranean, French
Ingredients: ¾ loaf (day old french bread, diced); 2 medium onions (halved and thinly sliced); 2 tablespoons butter (divided); 1 tablespoon oil; ½ teaspoon fresh thyme (or ¼ dried); 1 tablespoon granulated sugar; ½ tablespoon balsamic vinegar; 2 teaspoons minced garlic; 4 ounces fresh baby spinach (roughly chopped); 1 ¼ cup milk (I swapped out ¼ cup for heavy cream); 8 large eggs; 4 ounces crumbled feta cheese; 1 ½ cup shredded cheese*

Instructions

Prep:10minCook:1h 25min

A caramelized onion, spinach, and feta breakfast casserole. This Savory french toast casserole is easy to make ahead and pop it in the fridge. It's great to serve for brunch but also yummy with a side salad for dinner!

Updated at: Wed, 01 Jul 2026 02:00:21 GMT