Appetizers & Dips Easy Difficulty
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White Castle Craver Stuffed Portobello Mushrooms Recipe (Garlic Herb Bake)

White Castle Craver Stuffed Portobello Mushrooms are prepared by filling cleaned portobello mushroom caps with a savory stuffing of crumbled beef sliders, garlic herb cream cheese, parmesan, and Worcestershire sauce, then baking at 400°F (204°C) for 20 minutes until bubbling and golden brown. This keto-friendly Craver appetizer elevates everyday Original Sliders into gourmet party food.

White Castle Craver Stuffed Portobello Mushrooms Recipe (Garlic Herb Bake)
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Tested Copycat Method
Prep Time 15 mins
Cook Time 20 mins
Total Time 35 mins
Yield 6 large stuffed caps
Servings 6
Calories 295 kcal
Servings:

✦ Step-by-Step Instructions

5 Steps
1

Clean and Prepare Portobello Caps

⏱️ 5 mins

Preheat your oven to 400°F (204°C). Wipe portobello caps clean with a damp paper towel. Twist off stems and discard. Using a teaspoon, gently scrape out the dark gills from inside each cap to create a deep stuffing cavity. Brush both sides of the caps with olive oil and place gill-side up on a parchment-lined baking sheet.

💡 Pro Tip: Never submerge portobello mushrooms in water, as they act like sponges and release excess water while baking.
2

Mix Savory Slider & Cheese Filling

⏱️ 5 mins

In a medium mixing bowl, combine 6 crumbled White Castle sliders, 4 ounces softened cream cheese, 0.25 cup grated parmesan, minced garlic, Worcestershire sauce, and red pepper flakes. Mix with a fork until thoroughly incorporated into a thick, savory stuffing.

💡 Pro Tip: The slider bun crumbs absorb the mushroom juices during baking, locking in moisture.
3

Mound Stuffing into Mushroom Caps

⏱️ 5 mins

Divide the slider filling evenly among the 6 prepared mushroom caps, mounding slightly in the center. Sprinkle the remaining 0.25 cup parmesan cheese over the top of each cap.

💡 Pro Tip: Press the filling lightly into the edges so it forms a cohesive dome that browns evenly.
4

Bake Until Golden and Bubbling

⏱️ 20 mins

Bake at 400°F (204°C) for 18 to 20 minutes until the mushroom caps are fork-tender and the parmesan cheese crust is bubbly and golden brown.

💡 Pro Tip: If you desire extra browning, switch the oven to BROIL on high for the final 90 seconds.
5

Garnish and Serve

⏱️ 3 mins

Remove from the oven, let rest for 3 minutes, then garnish with fresh parsley and an optional light drizzle of aged balsamic glaze reduction. Serve warm with steak knives and forks.

💡 Pro Tip: Pair these hearty stuffed caps with cold lagers or dry red wine for game-day gatherings.

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Craver Test Kitchen Secrets

  • ✦ Wipe mushroom caps clean with a damp paper towel instead of rinsing; wet mushrooms create a soggy filling.
  • ✦ Leave the slider bun crumbs mixed into the cream cheese filling; the bread crumbs soak up mushroom juices and create a luxurious stuffing texture.
  • ✦ Assemble up to 24 hours in advance and keep refrigerated until ready to bake.

Recipe FAQs & Home Cooking Tips

Can you make White Castle stuffed mushrooms in an air fryer? ▼

Yes, you can air fry stuffed portobello mushrooms at 375°F (190°C) for 10 to 12 minutes until the cheese is bubbling and the mushroom is fork-tender.

Are White Castle stuffed portobello mushrooms gluten-free? ▼

No, standard White Castle slider buns contain wheat gluten, but you can prepare a gluten-free variation by discarding the buns and using only the steam-grilled beef patties mixed with cream cheese and parmesan.

Can I prepare these stuffed portobello caps ahead of time? ▼

Yes, assemble the stuffed caps up to 24 hours in advance, cover tightly with plastic wrap in the refrigerator, and bake straight from the fridge adding 3 extra minutes to the bake time.

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