Sneaking Dessert Before Bedtime

So yeah, I've been sneaking desserts into my room before bedtime. Mom's super strict about sugar after dinner and she always checks the kitchen when she thinks I'm being naughty. But last week, when we had those cookies left over from Aunt Jane's visit...I just couldn't resist. I hid them in my backpack and snuck up to my bedroom without a sound. The first night was totally nerve-wracking, but once I got past the fear of getting caught, it felt kinda like a secret treasure or something. But honestly, every time I do this, guilt starts building up inside me. What if Mom finds out? What if she thinks I'm a bad kid? And yet...those cookies were so tasty. Should I just be honest with her and promise to not do it again? Or keep on keeping it secret? It's like a little war going on in my head.