You want to cycle good, quality carbs during your cut. Oatmeal around your workouts is a great complex carb that provides slow release of energy for your workout and muscle maintenance on lower calories. Simple carbs, such as those from sugar, are very quickly processed and excess stored as fat. You should ditch processed sugars like those in pop tarts even in bulk mode, instead get real sugar from fruit. Fruit also has fiber, which is good for your insulin sensitivity. But during your cut you want to minimize sugar anyway. So get carbs from veggies, and eat a shitload of them because they are pretty low in carbs. And they help keep you full on a lower cal cut. And they have lots of micronutrients. And prob 1000 more reasons to load up on veggies during your cut.
Fats you want healthy unsaturated like those found in avocado, almonds, etc. You don't want to load up on saturated fat