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tuna pasta casserole gf

Gluten Free Tuna Casserole

This tuna casserole is part tuna mornay, part pasta bake. It's nutritious, filling and freezes well. It can be cut up into neat slices and makes a great lunch for the next day.
Prep 15 mins
Cook 30 mins
Total 45 mins
Course Lunch, Main Course
Servings 8


  • 340 g (12 oz) dried gluten free penne pasta (I've used GF Barilla Penne here)
Gluten-Free White Sauce
  • 60 g (2 oz) butter
  • 1/4 cup gluten-free flour
  • 2 cups milk
  • 3 tsp mustard (I've use Dijon mustard for a mild flavor)
Tuna Casserole Mix
  • 425 g (15 oz) can tuna (drained)
  • 2 eggs
  • 1/2 cup sour cream
  • 1 cup cheese (shredded/grated)
Breadcrumb Topping
  • 20 g (1 oz) butter
  • 1/2 cup cheese (shredded/grated)
  • 1/2 cup gluten-free breadcrumbs (panko style work well)


  • Preheat the oven to 180C/350F and lightly grease a rectangular oven pan (lasagne dishes work well).
  • Cook the gf penne in a large saucepan of salted boiling water following the directions on the box to achieve 'al dente'. Don't overcook it! Drain and set aside.

Gluten-Free White Sauce

  • Melt butter in a saucepan over a medium heat. Add the gluten-free flour and stir to a smooth paste.
  • Slowly add the milk and keep stirring until the mixture boils and thickens.
  • Remove the white sauce from heat and gently mix in the mustard. Set aside to cool slightly.
    gluten free white sauce recipe

Tuna Casserole Mix

  • Whisk the eggs and sour cream together in a large bowl.
  • Add the gf white sauce mixture and stir together until well combined.
  • Mix in the cup of cheese and the drained tuna. Season with salt and pepper to taste.
  • Pour in the cooked pasta and stir to combine.
  • Spread the mixture into the prepared pan and smooth the surface over.
    Gluten-Free Tuna Pasta Bake - Instructions + Process Shots

Breadcrumb Topping

  • Melt the 20g(1 oz) butter in the microwave, then add the 1/2 cup cheese and breadcrumbs and mix together.
  • Scatter evenly over the tuna casserole surface.
  • Bake in the oven for 30 minutes, or until set and golden on top.