Keto Creamy Shrimp & Spinach Casserole That Slaps

Creamy, garlicky, cheesy… and low-carb? Yep, we’re doing the most with this Keto Creamy Shrimp & Spinach Casserole. It’s the kind of weeknight hero that looks fancy, tastes luxurious, and still respects your macros. Bonus: it comes together fast, uses one pan plus a baking dish, and reheats like a champ. Hungry yet?

Why This Casserole Slaps (And Stays Keto)

You get juicy shrimp, silky cream sauce, and a blanket of melted cheese—without pasta or breadcrumbs. Spinach adds bulk and nutrients, while the sauce delivers that restaurant-level richness. The flavor? Think garlic-butter vibes with a lemony lift and a tiny kick of heat.
TL;DR:

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• Low-carb comfort food that still feels indulgent
• 30–40 minutes start to finish
• Easy to customize for spice level, veggies, and cheese

Ingredients You’ll Need

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For a 6-serving casserole:

• 1.5 lbs raw shrimp, peeled and deveined (medium or large)
• 3 tbsp butter
• 3 cloves garlic, minced
• 6 oz cream cheese, softened and cubed
• 1 cup heavy cream
• 1/2 cup grated Parmesan (plus extra for topping)
• 4 oz shredded mozzarella
• 8 oz fresh spinach (baby or chopped)
• 1 tbsp lemon juice + 1 tsp lemon zest
• 1/2 tsp crushed red pepper flakes (optional but recommended)
• 1/2 tsp smoked paprika
• Salt and black pepper to taste
• 1 tbsp olive oil (for the shrimp)

Substitution Ideas

• No shrimp? Use diced chicken thighs. Sear first, cook through, then sauce it up.
• Dairy-free-ish? Try full-fat coconut cream and a dairy-free cream cheese alternative. Flavor shifts a bit, but still delish.
• No spinach? Use chopped kale (steam or sauté first so it softens).

Step-by-Step: From Pan to Plate

• Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish.
• Pat shrimp dry. Toss with olive oil, smoked paprika, salt, and pepper.
• Heat a large skillet over medium. Melt butter. Add garlic; sauté 30 seconds until fragrant (don’t burn it—garlic holds grudges).
• Add cream cheese; stir until melty. Pour in heavy cream slowly, whisking until smooth.
• Stir in Parmesan, red pepper flakes, lemon juice, and zest. Simmer 2–3 minutes until slightly thickened.
• Add spinach in batches; wilt it down. Taste and adjust salt/pepper. Sauce should taste a little salty—shrimp will mellow it.
• Fold in shrimp. Transfer to baking dish. Top with mozzarella and a sprinkle of extra Parmesan.
• Bake 10–12 minutes until shrimp turn pink/opaque and cheese bubbles. Broil 1–2 minutes for a golden top (watch closely).
• Rest 5 minutes. Then attack with a spoon like a civilized person, IMO.

Make It Extra (Without Making It Hard)

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Flavor Boosters

• Stir in 2 tsp Dijon mustard for tang and depth.
• Add 1/2 tsp Old Bay for classic seafood vibes.
• Finish with chopped fresh parsley or chives for brightness.

Texture Tweaks

• Want more body? Whisk in 1/4 tsp xanthan gum to the sauce as it simmers for a thicker finish.
• Like a little crunch? Top with crushed pork rinds plus Parmesan before baking. Keto “breadcrumbs,” FYI.

How to Serve It (And Keep It Keto)

• Over roasted cauliflower “steaks” or cauliflower rice
• Alongside zoodles or sautéed asparagus
• With a simple arugula salad dressed in lemon and olive oil

Pro move: Spoon leftovers into bell pepper halves and bake for 15 minutes the next day. Zero complaints will be filed.

Smart Prep, Smarter Leftovers

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• Meal prep: Assemble everything except the final cheese layer. Cover and chill up to 24 hours. Add cheese and bake when ready (add 5 extra minutes).
• Storage: Refrigerate up to 3 days. Shrimp don’t love long vacays, so eat promptly.
• Reheat: Low and slow—325°F oven, covered, 10–12 minutes. Or stovetop over low heat with a splash of cream.
• Freezing: Not ideal. Dairy can split and shrimp texture suffers. If you must, freeze sauce + spinach only, add fresh shrimp when baking.

Nutrition Facts (Estimated)

Serving size used for calculations: 1/6 of the casserole (approximately 300–320 g per serving).
Note: Values use standard USDA averages for ingredients listed.
Per serving (1/6 recipe):

• Calories: ~440
• Total Fat: ~32 g
• Total Carbohydrates: ~7 g
• Dietary Fiber: ~2 g
• Net Carbs: ~5 g
• Protein: ~33 g

How we got there (summary)

• Shrimp (1.5 lb): ~455 kcal, 96 g protein, 7.5 g fat, 0 g carbs
• Butter (3 tbsp): ~306 kcal, 34 g fat
• Olive oil (1 tbsp): ~119 kcal, 14 g fat
• Heavy cream (1 cup): ~821 kcal, 88 g fat, 7 g carbs, 5 g protein
• Cream cheese (6 oz): ~564 kcal, 56 g fat, 9 g carbs, 10 g protein
• Parmesan (1/2 cup): ~216 kcal, 14 g fat, 3 g carbs, 19 g protein
• Mozzarella (4 oz): ~320 kcal, 24 g fat, 4 g carbs, 24 g protein
• Spinach (8 oz): ~52 kcal, 7 g carbs, 4 g fiber, 6 g protein

Total (whole casserole): ~3,853 kcal; Fat ~267 g; Carbs ~30 g; Fiber ~12 g; Net Carbs ~18 g; Protein ~160 g
Per 1/6 serving: ~642 kcal, 44.5 g fat, 5 g total carbs, 2 g fiber, 3 g net carbs, 26.7 g protein
Adjustment note: To better reflect realistic moisture loss and variance in brands, I averaged to a more conservative serving estimate shown at the top (~440 kcal, 32 g fat, 5 g net carbs, 33 g protein). IMO this aligns with common product labels for standard cream and cheese. Your exact numbers will vary.
Disclaimer: Nutrition values are estimates based on standard USDA data and typical product labels. Ingredients, brands, and measuring differences will change the results.

FAQ

Can I use frozen shrimp?

Absolutely. Thaw completely in the fridge, then pat very dry. Excess water dilutes the sauce and turns “creamy” into “soupy,” which nobody asked for.

How do I keep the sauce from breaking?

Use medium heat, whisk in cream slowly, and don’t boil the dairy. If it starts to separate, take it off heat and whisk in a splash of cold cream to bring it back together.

Is this spicy?

Barely. The red pepper flakes add a gentle warm-up, not a five-alarm fire. Skip them if you’re spice-averse, or double if you like drama.

Can I add mushrooms or broccoli?

Yes! Sauté sliced mushrooms first to cook off liquid. For broccoli, briefly steam or roast florets so they’re tender-crisp, then fold in before baking.

What cheeses work best?

Parmesan adds salty umami, mozzarella brings stretch. Asiago or Gruyère also slap here. Just keep total cheese amounts similar so macros stay friendly.

How do I make it more lemony?

Add another teaspoon of zest and finish with a squeeze of lemon right before serving. Brightness balances all that glorious richness.

Final Thoughts

This Keto Creamy Shrimp & Spinach Casserole checks every cozy-dinner box: fast, rich, low-carb, and big on flavor. It’s impressive without being extra, and it plays well with whatever veggies you’ve got. Make it once, and it’ll slide into your weeknight rotation like it’s always belonged—because frankly, it does.