Heat vegetable oil in a large pot or Dutch oven over medium heat.
Add the red curry paste, grated ginger, and minced garlic; sauté for 2 minutes until fragrant.
Whisk in the chicken broth and coconut milk, ensuring the curry paste is fully incorporated.
Stir in the fish sauce and brown sugar, then bring the liquid to a gentle simmer.
Add the frozen potstickers and sliced mushrooms to the pot.
Simmer for 6 to 8 minutes, or until the potstickers are heated through and float to the surface.
Stir in the baby spinach and lime juice, cooking for 1 minute until the spinach is just wilted.
Remove from heat and serve immediately, garnished with chopped cilantro and sliced green onions.