Step 1

Prepare muffin tins with cooking spray and preheat the oven 350°F.

Step 2

Heat oil in a large skillet on medium high heat.

Step 3

Stir and cook mushrooms until softened, then add onion and garlic to this. Once combined and onions are cooked through, add spinach and cook for another 3 minutes.

Step 4

Remove from heat and set vegetable medley aside.

Step 5

In a separate large bowl at room temperature, whisk in eggs, milk, Dijon mustard, and salt and pepper. To this, stir in cheese and mushroom mixture.

Step 6

Take a ladle and fill each sprayed muffin cup with prepared mixture.

Step 7

Place in the oven and bake for 30 to 40 minutes or until cooked through (toothpick inserted comes out clean).

Step 8

Serve warm and enjoy.