Search thousands of recipes reviewed by home cooks like you.

Spinach, Caramelized Onion, and Muenster Au Gratin Potatoes

Spinach, Caramelized Onion, and Muenster Au Gratin Potatoes

  • Prep

  • Cook

  • Ready In


A creamy cheesy au gratin potato dish with added spinach and caramelized onion goodness.

Ingredients {{adjustedServings}} servings

Serving size has been adjusted!

Original recipe yields 6 servings



Amount per serving ({{servings}} total)

  • Calories:
  • 427 kcal
  • 21%
  • Fat:
  • 34.7 g
  • 53%
  • Carbs:
  • 17.2g
  • 6%
  • Protein:
  • 13.3 g
  • 27%
  • Cholesterol:
  • 114 mg
  • 38%
  • Sodium:
  • 539 mg
  • 22%

Based on a 2,000 calorie diet


  1. Preheat an oven to 400 degrees F (200 degrees C). Combine the potatoes and spinach in a 9x13-inch baking dish; set aside.
  2. Melt 3 tablespoons of butter in a saucepan over medium-low heat. Stir in the onion, and cook until dark brown, about 15 minutes. Stir in the garlic and flour; cook 1 minute more. Season with salt, and stir in the milk and cream. Bring to a simmer over medium heat; cook and stir until the sauce has thickened, about 10 minutes. Stir in 3/4 of the Muenster cheese until melted, and pour over the potatoes.
  3. Cover the potatoes with aluminum foil, and bake in the preheated oven 30 minutes. Uncover, and cook 20 minutes more, then sprinkle with the remaining Muenster cheese, return to the oven, and bake until the potatoes are tender and the cheese is bubbly, about 10 minutes more.
Rate recipe

Your rating




Decadent - a major contributor to tonight's dinner of grilled pork chops and "Bacon Wrapped Asparagus," recipe also from this site. I used unpeeled, small Yukon Gold potatoes and just a hint of grated fresh nutmeg. The cream sauce, spinach and nutmeg was a match made in heaven. I made no other changes in ingredients, and none in terms of measurements or in the cooking method. That makes this easy - it's perfect just as is. The spinach was a creative addition and the Muenster lent just enough, but not too much, flavor. Exquisite.

Cat Lady Cyndi

These potatoes are outstanding! I followed the recipe as written, and couldn't be more pleased, even the cook times are spot on! The sauce was perfect in 10 minutes, and the bake time is perfect also. I was a bit skeptical when I poured the sauce over the potatoes and spinach because I didn't think it was enough, but I was so wrong, this recipe is perfect as written. Next time I'm going to use Swiss cheese and add some crumbled bacon, now that sounds wonderful as well! I agree with Christina, I believe many types of cheeses could be used in this with great results. Thanks for the recipe :)

lisa r

Delicious! My new favorite au gratin recipe. I added a little extra salt just for personal preference.