Prep the shrimp: Pat shrimp dry with paper towels.
Dry shrimp sear better and don’t steam. If using frozen, thaw fully and drain well.
Season: In a bowl, toss shrimp with salt, pepper, smoked paprika, and half the lemon zest. Set aside while you heat the pan.
Heat the pan: Place a large nonstick or stainless skillet over medium-high heat.
Add 1 tablespoon olive oil and let it shimmer.
Sear quickly: Add shrimp in a single layer. Cook 1–2 minutes per side until pink and just opaque. Remove to a plate.
Do not overcook.
Build the sauce: Lower heat to medium. Add remaining 1/2 tablespoon oil and the garlic. Sauté 20–30 seconds until fragrant, not browned.
Add red pepper flakes if using.
Deglaze: Pour in broth and scrape up browned bits. Simmer 1 minute to reduce slightly.
Finish with lemon: Stir in the remaining lemon zest and squeeze in 1–2 tablespoons lemon juice (to taste). The sauce should be bright and savory.
Optional veggies: If adding tomatoes or spinach, toss them in now.
Cook 1–2 minutes until tomatoes soften or spinach wilts.
Return shrimp: Add shrimp back to the pan and toss to coat in the sauce. Warm through for 30–60 seconds. Remove from heat.
Garnish and serve: Sprinkle with chopped parsley.
Taste and adjust salt, pepper, or lemon. Serve with steamed veggies, cauliflower rice, or a small portion of brown rice.