What I've seen more of is: people get promoted because they already do the job at the higher level, or close to it
I blend the oats and the flax seeds first, then add the rest, blend again for 10 secs, boom - easy. You may want to adjust peanut butter quantity depending on whether you’re trying to lose, maintain or gain weight. 2 tbsp is me trying to maintain weight as I easily lose weight.
Any particular reason for changing your dinner and not BF or lunch?
While peanut butter does contain some useful nutrients, there are much better choices out there in case someone would like to further improve/optimize their nutrition. Many topics in nutrition can be quite debatable but IMHO most other nuts outperform peanuts (which aren't even nuts) in many ways. Furthermore I'd say peanuts aren't that useful as a protein source in this situation given that protein powder is already being added.
I recently discovered the world of nut butters, and usually choose them over whole nuts due to easier digestibility and nutrient availability. Unless I'm eating macadamia nuts which already feel quite easy on the gut.