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Cheesy Au Gratin Potatoes

Make your own homemade Cheesy Au Gratin Potatoes! This potatoes au gratin recipe is an easy, healthy, and flavorful upgrade to an old classic.

Categories Baking, Side Dish
Difficulty Easy
Keyword cheesy au gratin potatoes, healthy au gratin potatoes, potatoes au gratin healthy
Prep Time 15 minutes
Cook Time 1 hour 5 minutes
Total Time 1 hour 20 minutes
Servings 8
Calories 221 kcal
Author Lacey Baier


  • 3 medium russet potatoes, sliced between 1/8 and 1/4-inch thick
  • 8 cremini mushrooms, fienly diced
  • 1/2 large yellow onion, finely diced
  • 4 strips nitrate-free bacon, chopped
  • 2 cloves garlic, minced
  • 1 tsp sea salt
  • 1/4 tsp ground black pepper
  • 1 tbsp olive oil
  • 3 tbsp chickpea (garbanzo bean) flour
  • 2 cups unsweetened almond milk
  • 3/4 cup PLUS 1/4 cup shredded cheddar cheese, divided
  • 1/8 tsp garlic powder


  1. Heat oven to 400 degrees.
  2. Place potato slices in a microwave-safe bowl and microwave on high for 6 minutes. This will save significant time baking, as it will start to cook the potatoes. If you're wanting to line the potato slices into a neat domino format (as pictured above), do this before heating in the microwave. Lining them up makes for a better presentation, but is not necessary.
  3. Over medium-high heat, cook bacon for 3-5 minutes, or until it begins to sweat.
  4. Add onion and mushrooms and cook until tender. 

  5. Add garlic and cook for one additional minute. Then, remove from heat.

  6. In a medium sauce pan, heat olive oil over medium heat. Mix in the chickpea flour, garlic powder, and sea salt, stirring constantly. Cook for one minute.

  7. Add the almond milk and stir to combine. Continue to cook, stirring very frequently, until mixture has thickened.(To get even thicker, can add 1 tsp. arrowroot starch, though this is not necessary).

  8. Add in 3/4 cups of the cheddar cheese, and stir until melted. 

  9. Combine the onion-mushroom-bacon mixture with the cheese sauce.
  10. If you lined the potato slices like dominos, just pour the cheesy onion contents over the potatoes and then giggle the baking dish some to get it to settle in the crevices. If you'd prefer to just combine it all together and not worry about the slices being in an orderly fashion, just gently toss to combine, making sure to coat the potatoes as evenly as possible, and then pour into the baking dish.
  11. Sprinkle the remaining cheese evenly over the top.

  12. Bake, covered with aluminum foil, for 40-50 minutes, until potatoes are completely tender. Remove aluminum foil and bake, uncovered, for an additional 10-15 minutes until top is golden brown.
Nutrition Facts
Cheesy Au Gratin Potatoes
Amount Per Serving (1 cup)
Calories 221 Calories from Fat 117
% Daily Value*
Fat 13g20%
Saturated Fat 5.1g26%
Cholesterol 24mg8%
Sodium 485.5mg20%
Carbohydrates 19.1g6%
Fiber 2.1g8%
Sugar 1.3g1%
Protein 8.1g16%
Vitamin A 800IU16%
Vitamin C 7.4mg9%
Calcium 280mg28%
Iron 1.1mg6%
* Percent Daily Values are based on a 2000 calorie diet.