If you're looking for a direct substitute, you could try using a combination of turmeric, coriander, and cumin. These spices are all commonly found in curry powder blends, and they'll give you a similar warm, earthy flavor. But, it's like trying to recreate a favorite recipe from memory - it's just not the same.
Another option is to use garam masala, which is like the cousin of curry powder. It's got a similar warm, aromatic flavor, but it's a bit more complex and nuanced. Think of it like the difference between a Mercedes and a BMW - both are great, but they've got their own unique personalities.
