Madison Karr 28.JPG
Madison Karr 92.jpg


I am the owner of Sincerely Sugar (previously Fatty Maddy's). I single handedly bake and decorate all the sugar cookies (as well as make and clean up all the messes).

I have been baking and decorating cookies, cupcakes and cakes for nearly a decade - all while going to school and now while also working as a pharmacist. I love to nerd out on math and science, and baking is the perfect way to blend that passion with my creative side.


I decorate custom sugar cookies for  parties, celebrations and professional events  all over Phoenix! Cookies are great for birthdays, grand openings, weddings, holiday parties... you name it!

All Sincerely Sugar cookies are made in my home. The kitchen is where I do all the baking, but I have I have my very own cookie room where I can focus on decorating, store all my cookie cutters and other gadgets, and binge watch my favorite Disney movies while I work!

Hi Everyone!

I love me some cookies!!!


Let's see what others are saying about Sincerely Sugar

Sincerely Sugar Cookies were absolutely perfect for the grand opening of our spa. Amazing detail, delicious and affordable! They were gone before I could even save a couple for myself! We got lots of compliments on them and will 100% use her again!

Christine Maddux

The Maddux A Skin Spa

I ordered cookies for a women's workshop I was co-hosting, and they were absolutely perfect! The vision for the style of cookies really came to life and added the perfect touch to the event. The fact that they were individually wrapped (with custom tags - love!) made them a very easy treat for guests to snack on during my workshop. Many people commented on how delicious they were, and just couldn't get over the adorable design. Working with Maddy is a breeze, and she's incredibly talented at what she does. I will definitely be using her for events in the future!

Preslie Hirsch

We have been using Sincerely Sugar's Custom Cookies for our client’s housewarming parties. Each time, our clients have lit up with joy when they see the cookies decorated custom to them, their new home, and their favorite things. We have also order the delicious and wonderfully designed cupcakes, too! We can’t wait to continue using Fatty Maddy’s for our housewarming parties and are happy to recommend them to anyone we know! 

The Myriad Home Group

I reached out to Maddy for some birthday cookies for my son’s one year birthday party and received a reply the same day - talk about great customer service! I told her we were doing a dinosaur theme and sent over a couple examples of what we were thinking of but left the creativity in her talented hands. The cookies exceeded our expectations - not only were the cookies absolutely adorable but they were delicious. Everyone at the party was so impressed by the attention to detail and the customization that they were all asking for her contact info! I can’t wait for our older sons birthday so we can place another order. I highly recommend Maddy and her talents! Thank you so much for making Jameson’s birthday a hit!

Jessica Nelson


 Voyage Phoenix Magazine 

Check out this article in Voyage Phoenix Magazine featuring Madison as one of Phoenix's most inspiring women

Ready. Set. ACTION!

Learn all about me, how I got started as a baker and the history of Sincerely Sugar (previously Fatty Maddy's) in this exclusive interview on Danny Brown Talks Phoenix.
Let's get in touch

Thanks for submitting! I will email you within 24 hours