"Bland" food doesn't have much flavor.

Use "bland" to describe food that's supposed to be:

• spicy
• salty
• flavored with spices

...but isn't. You probably shouldn't describe simple foods like bread or fruit as "bland".

"Bland" is always a negative description. If you want to describe food that doesn't have much flavor positively, you can say things like:

They're mild.

They have a really subtle flavor.