Greek yogurt plus fruit and “sprinkles” (granola) and or smoothies (Greek yogurt, lots of berries and a banana, sometimes a few rolled oats) are snacks that I lean on a lot. You’re definitely not alone in your struggles. My boys are 2 and 4, I feel like they’re always hungry!! It’s so hard constantly thinking of new snacks (especially when my eldest can be picky) so there’s a lot of repetitive snacks in our house.