Check two conditions in bash ?

Hi,

I trying to test two condition together (AND) under bash but it's not working...

The goal is ti have True when two variables are either not set or empty (empty string)

I've tried

 bash

    
if [[ -n VARIABLE1 && -n VARIABLE2 ]]; then
    echo "OK"
fi


  

Here I get the "OK" no matter what .

Thanks.