On medium-high heat, saute mushrooms in olive oil until golden and set aside. Using the same pan, saute the onion, bell peppers, and garlic with olive oil.
Meanwhile in another pan on medium-high heat, add curry paste and when hot, add shrimp and saute for 3 minutes, stirring to combine with curry paste. Now add coconut milk, minced ginger, salt/pepper, and the vegetables you already sauteed.
Bring to a simmer and heat for 10-15 minutes or until thickened to desired consistency. Add baby corn and bamboo shoots and cook for another 5 minutes. Serve warm topped with green onions.