Heat olive oil in an oven-safe skillet over medium heat.
Add sliced onion and cook until translucent, about 3-4 minutes.
Add garlic if using and cook for 30 seconds until fragrant.
Add shredded cabbage and dried herbs, cooking for 5-6 minutes until cabbage is softened.
Meanwhile, whisk eggs in a bowl with a pinch of salt and pepper.
Stir 3/4 of the grated cheddar into the egg mixture.
Pour egg mixture over the cabbage and onion in the skillet.
Sprinkle the remaining cheddar on top.
Cook on stovetop for 3 minutes until edges begin to set.
Transfer skillet to oven and bake for 10-12 minutes until frittata is fully set and cheese is melted and golden.
Remove from oven and let cool for 3-5 minutes before slicing.
Notes
Sharp cheddar provides a rich flavor that complements the mild cabbage perfectly.
For extra flavor dimension, add 1/2 teaspoon of Dijon mustard to the egg mixture.
The longer cooling time (3-5 minutes) allows the frittata to set properly for cleaner slices.
This recipe works well with red cabbage too, which adds a beautiful color contrast.
Nutrition
Per serving (for 4 servings): Approximately 260 calories, 16g protein, 5g carbs, 21g fat. The cheddar provides excellent protein while keeping carbs low for minimal blood sugar impact.