Preheat oven to 350 degrees Fahrenheit (180 degrees Celsius).

Combine all crumb ingredients in a small bowl. Mix well until a fine crumb forms. Set aside.

Prepare the batter: In a large mixing bowl, beat eggs and sugar for two minutes. Scrape sides of mixing bowl.

Add butter and vanilla. Beat until combined.

Combine flour, baking powder, baking soda, and salt in a large bowl. Add a third of the flour mixture to your mixing bowl. Beat until combined.

Add in the sour cream and beat until combined, followed by another third of the flour mixture, beating until combined.

Add milk and beat until combined, followed by remaining flour mixture, beating until combined.

Grease and flour a 9- x 13-inch (20- x 30-centimeter) baking pan or a Bundt pan. Pour in half the batter and sprinkle with half the prepared crumbs. Then pour in the remaining half of the batter, followed by the remaining crumbs.

Bake 55 to 60 minutes or until a toothpick comes out clean.