FOR THE STREUSEL
6 tablespoons unsalted butter melted
1 1/2 cups whole wheat flour
1/2 cup light brown sugar
1 1/2 teaspoons ground cinnamon
1/4 teaspoon kosher salt

FOR THE MUFFINS
2 cups all-purpose flour
1 tablespoon baking powder
1/2 teaspoon kosher salt
3 tablespoons blood orange zest (zest of one blood orange)
1/4 cup unsalted butter, melted
1 cup granulated sugar
1 cup Greek yogurt
1 large egg
1 teaspoon vanilla extract
1 1/2 cups blood orange segments, roughly chopped (about 4 oranges)

FOR THE GLAZE
1 cup powdered sugar
3 tablespoons blood orange zest (zest of one blood orange)
2 tablespoons blood orange juice