Thought my nana's recipe was gone forever. Found it, and it's even more delicious

Do you ever crave the comforting aroma of warm cinnamon swirling through your home? The nostalgic fragrance that brings back cherished memories of your grandma's kitchen? Well, look no further, because Nana's Cinnamon Roll Cake recipe is here to delight your senses and warm your soul. This delightful cake combines the heavenly flavors of cinnamon rolls with the ease of a classic cake recipe, making it a beloved treat for any occasion.
Growing up, I spent countless weekends at my Nana's house. Every Sunday morning, without fail, she would rise early and start her day in the kitchen. As the enticing aroma of cinnamon filled the air, my siblings and I would eagerly gather around the breakfast table. Nana would present the most heavenly cinnamon rolls, freshly baked and drizzled with a sweet glaze. Those Sunday mornings became a cherished tradition, bonding our family over warm, gooey bites of love.
Nana's Cinnamon Roll Cake
4 eggs
1/2 cup shortening
1 1/2 cups granulated sugar
2 teaspoons vanilla extract
1 cup buttermilk
1 tablespoon baking powder
2 cups all-purpose flour
1/2 teaspoon salt
For the filling:
1/2 cup brown sugar
4 teaspoons ground cinnamon
For the glaze:
2 cups powdered sugar
1/4 cup milk
3 tablespoons unsalted butter
1 teaspoon vanilla extract