👩🍳 Instructions
Make the Crumb Topping
Preheat oven to 350°F (175°C). Grease a 9×9 or 9×13 pan.
Mix flour, brown sugar, cinnamon, nutmeg, and salt.
Cut in butter until large crumbs form. Set aside.
Make the Cake
Whisk dry ingredients in one bowl.
In another bowl, mix pumpkin, oil, and sugar.
Add eggs one at a time, then vanilla.
Alternate adding dry ingredients and buttermilk, beginning and ending with dry.
Pour batter into pan and top with crumb mixture, pressing gently.
Bake
Bake 30–35 minutes (or 20–25 for 9×13) until a toothpick comes out with moist crumbs.
Cool slightly before glazing.
Make the Glaze
Whisk powdered sugar, milk, and vanilla until smooth.
Drizzle over warm cake and let set before slicing.
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