Portabella Mushroom Sliders – Canadian Style

These sliders, with mini portabellas, are piled with delicious maple caramelized onions. And then topped with Oka cheese and Canadian back bacon. These three ingredients make this little burger as Canadian as they come​.


Maple Caramelized Onions

  • 2 tbsp Olive oil

  • 3 Large onions, sliced into 1/8"

  • 3 tbsp Maple syrup

  • 2 tbsp Balsamic vinegar


  • 8 Mini portabella mushrooms

  • 1/2 cup Olive oil

  • 1 tbsp Balsamic vinegar

  • Salt & pepper

  • 8 Slices Oka cheese, or enough to cover mushrooms

  • 8 Slider buns

  • Dijon mustard

  • Mayonnaise

  • 8 Slices back bacon sliced into strips

  • 8 Bib lettuce leaves, trimmed for slider buns


Maple Caramelized Onions

  1. Heat the oil in a large skillet over medium high heat

  2. Add the onions and cook, stirring, until starting to soften.

  3. Stir in 1/2 cup water & bring to a boil.

  4. Reduce heat to medium low and simmer until most of the liquid has disappeared.

  5. Stir in another 1/2 cup water, continue cooking 30-40 minutes, adding water as needed.

  6. Stir in maple syrup and balsamic vinegar.

  7. Cook, stirring until onions are brown and most of the liquid has evaporated.

  8. Remove from heat and set aside


  1. Wash mushrooms and remove stems.

  2. Put mushrooms in a shallow dish and whisk together olive oil, vinegar, salt and pepper.

  3. Pour olive oil mixture over mushrooms, turning to coat

  4. Allow to sit for 30 minutes while onions are cooking.

  5. Oil grill with cooking spray and heat to medium high.

  6. Grill mushrooms covered, about 5 minutes each side

  7. During the last minute of grilling, top each mushroom, stem side with cheese. Cover and heat until cheese is melted. Remove from grill.

  8. Assemble the slider buns by spreading with Dijon mustard and mayonnaise on each half.

  9. Top the bottom halves with lettuce, bacon, and caramelized onions.

  10. Add the cheese topped mushrooms, and top with the other half of the slider bun.

  11. Enjoy!

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