Caramelized Onion, Mushroom and Ricotta Skillet Frittata
Breville Test Kitchen

Breville Test Kitchen

Caramelized Onion, Mushroom and Ricotta Skillet Frittata

Balsamic vinegar is the secret ingredient in the caramelized onions, it adds a richness that compliments the sweetness. Dotted with ricotta, the frittata is perfect for a light lunch.
the Smart Oven® Air Fryer Pro
the Smart Oven® Air Fryer Pro Product Details

the Smart Oven® Air Fryer Pro

1 hr total time

30 mins active time


Serves 8



  • unsalted butter icon
    4 tbsp (2 oz) unsalted butter


  • yellow onion icon
    3 yellow onions

    thinly sliced

  • kosher salt icon
    1 tsp kosher salt


  • light brown sugar icon
    1 tbsp light brown sugar
  • balsamic vinegar icon
    1 tbsp balsamic vinegar
  • baby bella mushrooms icon
    8 oz baby bella mushrooms


  • large egg icon
    10 large eggs
  • heavy cream icon
    1 cup (8 fl oz) heavy cream
  • freshly ground black pepper icon
    Freshly ground black pepper

    to season

  • fresh thyme leaves icon
    1 tsp fresh thyme leaves
  • ricotta cheese icon
    5 oz ricotta cheese


  • 1Before you start, check that your 11-inch cast iron skillet fits in the oven. Melt the butter in the skillet over medium heat. Add the onions and salt and cook, stirring occasionally, for 10 minutes, or until starting to brown. The salt helps draw moisture out of the onions.
  • 2Add the sugar and vinegar and cook, stirring occasionally, for 3 minutes.
  • 3Cook, stirring occasionally, for 5 minutes, or until softened. Set aside in a bowl to cool slightly. Wash and dry the skillet.
  • 4Then add the remaining salt, pepper, thyme and onion mixture and stir to combine.
  • 5Insert the wire rack into position 6. Set the oven to Bake, Convection, 350°F for 20 minutes and press Start to preheat. Meanwhile, continue to the next step.
  • 6Place the skillet over medium-high heat and add the remaining butter. Swirl to coat the base and side, this prevents the frittata from sticking.
  • 7Pour the egg mixture into the skillet and crumble the ricotta over the top.
  • 8Once preheated, place the skillet in the oven cook for 20 minutes.
  • 9The frittata should be golden brown. If not, cook it a little longer.
  • 10Stand for 10 minutes to cool slightly.
  • 11Serve with a salad.
Main course

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