Growing Muffins into A Birthday Cake

I started out with a basic muffin recipe and each week I would experiment with different ingredients, swapping blackberries for blueberries, fresh fruit with dried fruit. Then moving onto experimenting with different flours, whole wheat, red wheat, einkorn, emmer, etc. Next, I focused on the liquid ingredients: swapping in different textured yogurts (strained, Greek yogurt, dairy-free,