Depends on your goals. I know I deliberated for quite some time with what I wanted, didn't stick to a proper diet or anything...so I can't give more precise advice. I can assure that simply increasing intake of good shit will give results, but it might be a little slow for your liking or you might find you aren't 'feeling it' so to speak.
If you decide that you want to smash it out a bit faster or want an easier way to increase calories again without having to cook so much, you might be interested in looking at a good* mass gainer. It will provide the extra fuel you'll need for sure. Otherwise definitely just stick with the BN and push hard. This is where you want to get into the big lifts like deadlifts and squats.