If you’re struggling to make a healthy eating choice, then toast and peanut butter will always be a lot better than many other options with too much (refined) sugar, unhealthy fat, salt or added e-numbers and preservatives. However, you can increase the health benefit by making your toast wholemeal or multigrain (or rye or other low gluten-types), chose the best ingredients Peanut butter you can (as low salt and low mono saturated fat as possible, avoiding e-numbers and preservatives) or chose an alternative nut butter like almond or cashew. You can amp it up by considering topping it with banana slices, chia seeds, a pinch of cinnamon etc. Then you have a delicious and healthy breakfast or snack that isn’t too boring!
It's also delicious and that's good for your mindset too.