What’s the best way to override ButtonDefaults.MinSize to render a smaller Material 3 Button composable? I want to scale the button size according to the Text content + a bit of contentPadding similar to how wrap_content behaves in view system.

You can create a custom Button that mirrors the material button, you need to copy the ButtonDefaults and all of this stuffs, but you can also create a simple button using Box with clickable Modifier if that fits your needs.