Ina Garten's Triple Chocolate Loaf Cakes

INGREDIENTS

16 tbsp

unsalted butter, at room temperature

2 cups

plus 2 tablespoons all-purpose flour, divided

1 cup

boiling water

5 oz

bittersweet chocolate, such as Lindt, roughly chopped

2 tbsp

unsweetened cocoa powder, such as Pernigotti

1 tsp

instant coffee granules, such as Nescafé

1 tsp

baking powder

1 1/2 tsp

kosher salt

1 cup

roughly chopped walnuts

1 cup

semisweet chocolate chips

1 cup

granulated sugar

1 cup

dark brown sugar, lightly packed

extra-large eggs, at room temperature

2 tsp

pure vanilla extract