Sweet Peach Muffins with Brown Sugar-Walnut Streusel Topping

INGREDIENTS

1 1/2 cups

coarsely chopped walnuts

1/3 cup

all-purpose flour

1/3 cup

firmly packed light brown sugar

1/2 tsp

ground cinnamon

3 tbsp

unsalted butter, softened

2 cups

all-purpose flour

1 cup

sugar

1 tsp

baking powder

1/2 tsp

baking soda

2 tsp

ground cinnamon

1/2 tsp

ground allspice

1/2 tsp

salt

large eggs

3 tbsp

unsalted butter, melted

1 1/2 cups

sour cream

1 tbsp

dark rum or pure vanilla extract

1 1/2 cups

peeled, pitted, chopped peaches