Keto Weight Watchers Portabella Mushroom Pizzas

Prep: 15 minCook: 12 min24 servingsmediumAmerican
Weight Watchers Portabella Mushroom Pizzas with Spinach

Individual portabella mushroom caps transform into satisfying pizza alternatives with a savory spinach and mozzarella topping. These Weight Watchers-friendly pizzas deliver classic Italian flavors while keeping calories in check. The meaty mushroom base provides earthy richness that pairs beautifully with herbs and cheese. Perfect for weeknight dinners when you want comfort food without the guilt, or as an elegant appetizer for entertaining. The combination of fresh tomatoes and melted cheese creates that familiar pizza experience in a healthier format.

Ingredients

24 servings
  • 5 oz frozen chopped spinach
    fresh spinach5 oz frozen = 10 oz fresh

    cook and drain fresh spinach first

    Full guide →
  • 1 tsp dried basil, crushed
  • 1 ½ cup shredded mozzarella cheese
    dairy-free cheese1:1dairy-freevegan

    similar melt

    Full guide →
  • ¼ tsp black pepper, coarse ground
  • 12 portabella mushrooms, 3 or 4 inch diameter
  • 2 medium tomatoes, large diced
  • 2 tbsp butter or margarine, melted
    olive oil1:1dairy-freevegandairy-free

    slightly different flavor

    Full guide →
  • salt, to taste(optional)

Instructions

  1. 1

    Thaw frozen spinach then place between paper towels and press out the liquid

  2. 2

    Chop spinach finely

  3. 3

    Preheat oven to 350° F

  4. 4

    In a mixing bowl, add spinach, basil, mozzarella cheese, and black pepper and stir to combine

  5. 5

    Prepare mushrooms by cleaning and removing the stems

  6. 6

    On a greased baking sheet, place the mushroom caps with the top side down

  7. 7

    Using a basting brush, brush the mushroom caps with butter

  8. 8

    Using a spoon, add approximately 2 tablespoons of the spinach mix into each mushroom

  9. 9

    Sprinkle with diced tomatoes and salt

  10. 10

    Bake in preheated oven approximately 12 minutes or until heated through

  11. 11

    Cut mushroom in half before serving

Tips

Tip 1

Press spinach thoroughly to remove excess moisture - wet spinach will make pizzas soggy and prevent proper browning.

Tip 2

Choose firm portabella caps without dark spots for best texture and appearance after baking.

Good to Know

Storage

Refrigerate assembled pizzas up to 1 day before baking. Store baked pizzas up to 3 days refrigerated.

Make Ahead

Can assemble mushrooms with spinach mixture up to 4 hours ahead. Add tomatoes and bake just before serving.

Serve With

Serve immediately while cheese is melted. Cut each mushroom in half for individual portions.

See pairing guide →

Common Mistakes

Watch

Press spinach thoroughly to avoid watery pizzas that won't brown properly

Watch

Don't skip greasing the baking sheet or mushrooms will stick

Substitutions

Dairy-Free Swaps

mozzarella
dairy-free cheese1:1dairy-freevegan

similar melt

Full guide →
butter
olive oil1:1dairy-freevegandairy-free

slightly different flavor

Full guide →

General Alternatives

frozen spinach
fresh spinach5 oz frozen = 10 oz fresh

cook and drain fresh spinach first

Full guide →
Find more substitutions →

FAQ

Can I use fresh spinach instead of frozen?

Yes, use about 10 oz fresh spinach. Cook it down first, then drain and chop. Fresh spinach has more volume than frozen when raw.

How long will these keep in the refrigerator?

Store baked portabella pizzas up to 3 days refrigerated. Reheat in oven at 300°F for 5-8 minutes to restore crispness.

Can I freeze these portabella pizzas?

Freeze assembled but unbaked pizzas up to 2 months. Bake directly from frozen, adding 5-8 extra minutes to cooking time.