Skip to main content

Blue Cheese and Caramelized-Onion Squares

Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Jan 2026

Meets Patient’s editorial guidelines

These blue cheese and caramelised onion squares offer a sophisticated balance of flavours, combining the deep sweetness of slow-cooked onions with the sharp, salty punch of melted blue cheese. Built on a simple, light olive oil crust, this vegetarian dish is an excellent alternative to traditional pizza or puff pastry tarts. The addition of fresh rosemary provides a fragrant, woody undertone that cuts through the richness of the cheese, making every bite feel indulgent yet balanced.

Perfect as a savoury snack, a light lunch served with a crisp green salad, or sliced into smaller portions for party canapés, this recipe is remarkably versatile. The homemade dough is quick to prepare and requires no proving, making it an ideal choice for effortless entertaining. Whether served warm from the oven or at room temperature, these squares are a reliable crowd-pleaser for any occasion.

In this article:

Continue reading below

Ingredients for Blue Cheese and Caramelized-Onion Squares

  • 250g plain flour

  • 2 teaspoons baking powder

  • 3/4 teaspoons salt

  • 180ml whole milk

  • 60ml olive oil

  • 2 tablespoons (1/4 stick) unsalted butter, melted

  • 2 tablespoons (1/4 stick) unsalted butter

  • 2 tablespoons olive oil

  • 3 large onions (about 900g ), halved, thinly sliced

  • 1 tablespoon finely chopped fresh rosemary

  • 1 teaspoon sugar

  • 1/2 teaspoons salt

  • 170g (about 170g ) crumbled blue cheese

How to make Blue Cheese and Caramelized-Onion Squares

Preheat oven to 218°C. Mix flour, baking powder, and salt in medium bowl to blend. Make well in centre of dry ingredients. Whisk milk, olive oil, and melted butter in liquid measuring cup to blend. Slowly pour milk mixture into well in dry ingredients, stirring until just blended and smooth. Roll out dough on lightly floured surface to 10x13-inch rectangle. Transfer dough to rimmed baking sheet. Re-form dough into 10x13-inch rectangle (dough will shrink when moved). Pierce dough all over with fork. Let dough rest while preparing topping.

Melt butter with oil in large skillet over high heat. Add onions. Cook until onions are soft and beginning to brown, stirring frequently, about 10 minutes. Add rosemary, sugar, and salt. Season onions to taste with pepper. Reduce heat to medium. Continue to cook until onions are soft and dark brown, stirring frequently, about 20 minutes; cool.

Spread onion mixture evenly over dough. Sprinkle with cheese. Bake until crust is golden and cheese is bubbling, about 20 minutes. Let cool. Cut into squares and serve.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 17 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
flu eligibility checker

Ask, share, connect.

Browse discussions, ask questions, and share experiences across hundreds of health topics.

symptom checker

Feeling unwell?

Assess your symptoms online for free

Sign up to the Patient newsletter

Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.

Please enter a valid email address

By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.