Welcome. Glad to have you
As far as the peanut butter goes, if you are eating it with the oatmeal as well as the milk, I would say it would be okay, but I would cut it back to one T rather than two. It still boils down to calories in and calories out, and the oatmeal plus two T of peanut butter and milk would be close to 400 calories. One T would be a more reasonable portion I think since you are having milk. One days you have peanut butter at breakfast, I would not eat nuts as a snack.. have something else. Like some veggies...always room for more veggies
Yes popcorn would be eaten as a snack.

yum