I’m always on the look out for a fun appetizer that is quick and easy to make.  Give these Caramelized Onion and Mushroom Bites a try at your next party or gathering.  The filling alone will WOW your tastebuds and paired in these Phyllo Shells, you have an instant one bite appetizer

Caramelized Onion and Mushroom Bites

Watch for a quick Tasty Onion and Mushroom Bites Video



Ready In:

30 Minutes

Good For:


About this Recipe

Looking for an Appetizer that no one else will think of to bring to your next party? I’ve got you covered with these Caramelized Onion and Mushroom Bites.  Sautéed to perfection paired with a deglaze Balsamic Vinegar and it’s truly a party in your mouth

What is an Appetizer?

I’ve always been told that an Appetizer is a small bite of food or drink eaten before a meal to help wake up your tastebuds and prepare you for the main course.  These fun one bite Appetizers are so quick and easy to make and I love the combination of flavors.  

Mushroom and Onion Bites

With only a few simple ingredients you can quickly make Caramelized Mushroom and Onion Bites.  Have you seen Phyllo shells in the freezer section of your grocery store?  They are located by the puff pastry and often times frozen pies.  These pastry shells are pre-baked, which means you don’t need to do anything except fill them!  Hooray for easy an Appetizers recipe!

I start by Sautéing the mushrooms in a hot pan with some butter.  But don’t forget to wash your vegetables.  Choose small button mushrooms and I like to remove the stems.  Personal preference really.  😉 

Coat the mushrooms in onions and stir, the mushrooms will reduce down (become smaller in size) and more tender.  Then remove them from the heat and set aside.

In the same frying pan add a little more butter and sliced onions and stir.  I like to cook onions over medium heat as it slows the cooking process down and allows the wonderful flavors to come out.  YUM!

Once the onions are ready, add the sugar and balsamic vinegar and stir.  Add in Mushrooms and stir.  These will quickly caramelize so watch your heat.  Slow is good!

Fill each Phyllo Shell with about 1 tsp of the filling and sprinkle cheese on top.  

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Quick Tips

Can’t find Phyllo Shells at your local store?  Try using Puff Pasty instead.  Cut into small squares and put in a mini cup cake pan.  Add filling and Bake at 350 for 8-10 minutes or until puff pasty is golden brown.  Top with cheese and serve!  Delish!

Yield: 7 servings

Caramelized Onion and Mushroom Bites

Caramelized Onion and Mushroom Bites
Caramelized Onion and Mushroom One bite Appetizer, Sautéed Mushroom and Onions with a deglazed Balsamic Vinegar and Swish Cheese. Delish
Prep Time 5 minutes
Cook Time 20 minutes
Total Time 25 minutes


  • 6 oz Button Mushrooms Sliced
  • 1 Medium Onion Sliced thin
  • 1/2 Cup Grated Swiss Cheese
  • 4 Tbs Butter *Divided
  • 1 1/2 Tbs Sugar
  • 2 Tbs Balsamic Vinegar
  • Salt and Pepper to Taste
  • 1 Pkg Phyllo Cups
  • 1 Tbs Fresh Thyme


  1. Wash and slice mushrooms and set aside. I like to remove the stems (optional)
  2. Thinly slice onion and set aside
  3. Heat frying pan over medium/high heat
  4. Add 2 Tbs Butter* and add mushrooms to hot pan.
  5. Saute Mushrooms for 3-5 minutes or until tender and remove from heat and set aside
  6. Add 2 Tbs Butter to hot pan and allow butter to melt
  7. Add sliced onions
  8. Stir to coat and sauté' for 5-8 minutes over medium heat.
  9. When onions have reduced down add sugar and balsamic vinegar and salt and pepper to taste. Stir
  10. Add cooked mushrooms and stir
  11. If necessary cut with a knife to make smaller pieces
  12. Add 1 tablespoon filling to each Phyllo Shell and sprinkle Swiss Cheese on top.
  13. Garnish with Fresh Thyme
  14. Serve and enjoy


*Phyllo Shells can be thrown into the oven under Broil for 1 minute to melt cheese if desired

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Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 126 Total Fat: 10g Saturated Fat: 6g Trans Fat: 0g Unsaturated Fat: 3g Cholesterol: 27mg Sodium: 115mg Carbohydrates: 7g Fiber: 1g Sugar: 5g Protein: 3g
This is an approximate calculation by Nutritionix. Please consult your doctor for dietary needs

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