The Impossible™ Slider
The White Castle Impossible™ Slider features a 2.0-ounce plant-based Impossible™ burger patty seared on a flat-top grill and topped with Smoked Cheddar cheese, sweet caramelized onions, and dill pickles on a 100% dairy-free and egg-free square bakery bun.
Portion: 1 Slider w/ Cheese (82 g / 2.89 oz) · Delivery Est: $3.65
Vegan Ordering Tip: White Castle automatically discounts $0.30 when ordering without cheese ($2.69 vs. $2.99), dropping calories from 220 to 190 and removing all dairy.
Impossible™ Slider Menu Builds
4 buildsThe Impossible™ Slider Nutrition & Macronutrients
One White Castle Impossible™ Slider with Cheddar (82g) provides 220 calories, 12g fat (6g saturated), 570mg sodium, 17g carbs, and 12g plant protein. Ordering with No Cheese (75g) lowers energy to 190 calories, reduces sodium to 470mg, and eliminates all dairy.
Portion: The Impossible™ Slider (w/ Smoked Cheddar)
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet (2,000 calories).
Allergen & Plant Preparation Profile
Official FDA major allergen audit and dedicated green-spatula kitchen protocols.
Best Sauces & Vegan Condiment Pairings
Dipping sauces that pair with seared plant-based burger patties.
Sharp stone-ground spicy brown mustard that complements seared plant heme without extra calories.
Rich hickory tomato barbecue sauce enhancing the char-grilled savory flavors of plant-based patties.
Cool herb buttermilk dressing ideal for dipping cheesy Impossible sliders or crinkle fries.
Signature creamy horseradish-spiced dipping sauce delivering a sharp pepper punch.
The Impossible™ Slider Prices & Vegan Discount
Unlike chains that charge the same price when removing cheese, White Castle automatically deducts $0.30 when you order the Impossible™ Slider without Smoked Cheddar ($2.69 vs. $2.99).
| Menu Order Tier | Portion | In-Store Price | Value Note | Delivery Est. |
|---|---|---|---|---|
| 1 Impossible™ Slider (No Cheese · 100% Vegan) | 1 Vegan Slider (75g) | $2.69 | $2.69 | $3.25 – $3.39 |
| 1 Impossible™ Slider (w/ Smoked Cheddar) | 1 Vegetarian Slider (82g) | $2.99 | $2.99 | $3.59 – $3.75 |
| 2 Impossible™ Sliders (À La Carte Pair) | 2 Sliders (164g) | $5.38 – $5.98 | $2.69 – $2.99 | $6.99 – $7.49 |
| Impossible™ Slider Combo (2 Sliders + Sides) | 2 Sliders + Small Fries + 21 oz Drink | $9.79 | $2.95 eq. | $11.89 – $12.39 |
| 10-Slider Impossible™ Crave Clutch | 10 Impossible Sliders | $27.99 | $2.80 | $33.49 – $34.99 |
| 30-Slider Impossible™ Crave Case | 30 Impossible Sliders | $79.99 | $2.67 | $94.99 – $98.99 |
Impossible™ Slider vs. Veggie Slider vs. The Original Slider
While the Southwest Veggie Slider features whole black beans, corn, and red peppers (6g protein), the Impossible™ Slider replicates the savory texture, iron, and 12g protein profile of seared beef.
| Specification | Impossible™ (Cheddar) | 100% Vegan Impossible™ | Southwest Veggie | The Original Slider® |
|---|---|---|---|---|
| 2026 Single Price | $2.99 | $2.69 | $2.49 | $1.19 |
| Calories | 220 kcal | 190 kcal | 190 kcal | 140 kcal |
| Protein | 12g | 10g | 6g | 6g |
| Total Fat / Sat. Fat | 12g / 6g | 9.5g / 4.5g | 10g / 2g | 7g / 2.5g |
| Dietary Fiber | 2g | 2g | 3g | 1g |
| Sodium | 570mg | 470mg | 380mg | 380mg |
| Protein Sourcing | Soy Protein + Heme | Soy Protein + Heme | Dr. Praeger's 9 Vegetables | 100% USDA Beef |
| Cooking Style | Flat-Top Seared | Dedicated Flat Grill | Dedicated Vegetable Grill | Steam-Grilled over Onions |
White Castle Impossible™ Slider Ingredients
The White Castle Impossible™ Slider is crafted with a 2.0 oz plant-based Impossible™ patty containing soy protein concentrate, sunflower and coconut oils, potato protein, and yeast extract, seared on a flat-top grill and served on a 2×2-inch square bakery bun.
Formed from soy and potato proteins fortified with plant leghemoglobin (heme) to deliver 12g of protein with zero beef tallow or animal cholesterol.
Seared in a dedicated zone of the flat griddle using a distinct green-handled spatula away from beef sliders to prevent animal fat cross-contact.
Served on White Castle's signature dairy-free and egg-free bakery bun, topped with pasteurized Smoked Cheddar cheese (omit for 100% vegan).
Other White Castle Sliders to Compare
The Impossible™ Slider FAQs
Is the White Castle Impossible Slider 100% vegan? ▼
No, the default Impossible Slider is lacto-vegetarian because it comes topped with a slice of dairy Smoked Cheddar cheese. However, if you order the Impossible Slider with 'No Cheese,' it is 100% vegan—both the Impossible patty and White Castle's signature square bakery bun are completely dairy-free and egg-free.
Does White Castle cook the Impossible Slider on a separate grill from beef? ▼
Yes, White Castle kitchen procedures specify cooking the Impossible Slider patty on a designated section of the flat-top grill using a separate color-coded green-handled spatula away from beef sliders.
Are White Castle Crinkle-Cut Fries vegan to pair with the Impossible Slider? ▼
Yes, White Castle Crinkle-Cut Fries are 100% vegan. They contain only potatoes, vegetable oil, and salt, and are fried in 100% plant-based soybean oil with zero animal tallow.
Why does the Impossible Slider have twice as much protein as The Original Slider? ▼
The Impossible Slider uses a thicker 2.0-ounce plant-based soy and potato protein patty that is seared on a flat-top griddle, delivering 10g to 12g of protein compared to 6g in the 0.88-ounce steamed Original beef patty.
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