Go Back
+ servings
This is not your average cheese panini!

Smoky Cheese & Caramelized Onion Panini

I set out to make the perfect vegetarian cheese panini filling and this is the result! Packed with flavor and lots of melty, smoky, cheesy filling, it's a panini recipe that everyone can enjoy.
4.84 from 12 ratings

Ingredients

  • 2 panini breads
  • 2 red onions, thinly sliced
  • 1 Tbsp butter
  • ½ Tbsp mayonnaise or additional butter
  • 2 tsp dijon mustard
  • 75 g (2.65 oz) smoked cheddar cheese, grated
  • 75 g (2.65 oz) fresh mozzarella, thinly sliced

Instructions 

  • First, caramelize the onions. On a very low heat- the lowest your hob can manage- melt the butter into a pan and stir in the onions. Leave for around 30 minutes to 1 hour (It really depends on how low your heat can go- the lower the heat, the slower they will cook. You want it as slow as possible for a good flavor and texture.)
  • Slice the paninis, and spread with mayo and mustard.
  • Add the fillings in this order: 2/3rds of the smoked cheddar, mozzarella, red onions, remaining 1/3rd of the smoked cheddar.
  • Seal panini and press in a grill or frying pan until the cheese is melted. You can brush the outsides with oil to get extra crispiness but it's not required.

Notes

I used paninis from Costco. They're a bit smaller than the usual ones you get in cafes. I'm not sure whether they are the same as the ones in the US or Canadian Costcos. In any case, you may wish to scale up the ingredients if you think your paninis are a little bigger.
Serving: 1g, Calories: 541kcal, Carbohydrates: 43g, Protein: 24g, Fat: 30g, Saturated Fat: 16g, Polyunsaturated Fat: 3g, Monounsaturated Fat: 8g, Trans Fat: 1g, Cholesterol: 84mg, Sodium: 907mg, Potassium: 295mg, Fiber: 3g, Sugar: 5g, Vitamin A: 812IU, Vitamin C: 8mg, Calcium: 533mg, Iron: 1mg