Heat oil in a 6-to-8-quart stovetop pressure cooker over medium-high, or in an electric pressure cooker set to saute. Add shallots, garlic, and mushrooms and cook, stirring, until shallots are golden, 6 to 8 minutes. Add curry paste and fish sauce and cook, stirring, until fragrant, about 1 minute. Add squash, coconut milk, 1 1/2 cups water, and 1/2 teaspoon each salt and pepper.

Stovetop: Secure lid. Bring to high pressure over medium-high heat; reduce heat to maintain pressure and cook 12 minutes. Remove from heat and quickly release pressure, then remove lid.

Electric: Secure lid. Manually set cooker to 15 minutes and let it come to pressure. Once time is complete, turn off and quickly release pressure, then remove lid.

Stir in noodles and let stand until tender, about 5 minutes. Add lime juice; stir to combine. Transfer curry to bowls, top with peanuts and cilantro, and serve.