Which of the following ingredients is NOT part of the Spicy Vegan Curry?

The ingredient that is not part of the Spicy Vegan Curry is the inclusion of chicken. This dish is specifically designed to cater to a vegan diet, meaning it excludes all animal products, including meat. In this context, chicken would not be appropriate as it contradicts the very essence of a vegan recipe.

The other options — roasted mushrooms, Thai basil, and snap peas — align perfectly with the principles of vegan cooking. Roasted mushrooms can add depth and umami flavor, while Thai basil contributes a fresh, aromatic quality. Snap peas add a crisp texture and vibrant color, making them perfect for a balanced and flavorful vegan curry. Thus, chicken stands out as the only non-vegan ingredient among the choices provided.