Delicious Pumpkin Coffee Cake (Bakery-Style Crumb)

Ingredients

• 2 cups (240 g) all-purpose flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 2 teaspoons pumpkin pie spice
• 1/2 cup (115 g) unsalted butter, softened
• 1/2 cup (100 g) granulated sugar
• 1/2 cup (100 g) light brown sugar, packed
• 2 large eggs, room temperature
• 1 cup (245 g) pumpkin puree (not pie filling)
• 1/2 cup (120 g) full-fat sour cream
• 1 teaspoon vanilla extract
• 3/4 cup (90 g) all-purpose flour
• 1 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 6 tablespoons (85 g) cold unsalted butter, cubed
• 1/2 cup (55 g) chopped pecans (optional)
• 1 cup (120 g) powdered sugar
• 2 tablespoons whole milk
• 1/2 teaspoon vanilla extract