Upside Down Potato & Onion Tart

Recipe by Sharon123
READY IN: 1hr 5mins
YIELD: 1 tart


  • 2 12
    tablespoons butter
  • 12
    sprigs thyme, strip the leaves from the stems
  • 1
    large onion, sliced somewhat thickly (a tad more than 1/4 inch thick)
  • 1
    lb waxy red potatoes, washed and very thinly sliced
  • 2
    tablespoons olive oil
  • 12
    cup grated gruyere cheese
  • 12
    cup crumbled feta cheese
  • 1
    cup grated mozzarella cheese
  • sea salt and black pepper


  • Preheat oven to 400*F.
  • Melt the butter in a 9-10 inch ovenproof frying pan (cast iron is great) over medium heat. Add the thyme and onion and cook for 5 minutes. Spread out evenly in the pan.
  • Place the potato, oil, cheeses, salt and pepper in a bowl and toss to combine.
  • Top the onion with the potato mixture, spreading out evenly over the onions, and bake for 45 minutes or until golden brown and cooked through. Turn upside down to serve.
  • Note: For an extra cheesy tart, double the amount of mozzarella.