Brown Butter and Cardamom Plantain Bread

Name: Brown Butter and Cardamom Plantain Bread
Ingredients: For the Plantain Bread; 8 tablespoons unsalted butter; 2 cups all-purpose flour; 2 teaspoons baking powder; 1 teaspoon baking soda; 1/2 teaspoon salt; 1 teaspoon ground cardamom; 2 over-ripe plantains; 3/4 cup brown sugar; 1 egg; 2 teaspoons vanilla extract; 1/2 cup vanilla Greek yogurt; For the Streusel Topping; 1/3 cup all-purpose flour; 4 tablespoons cold unsalted butter (grated); 1/4 cup brown sugar; 1/4 cup granulated sugar