FOR THE CRUMB TOPPING: – 1/2 cup (65 grams) all-purpose flour , spooned & leveled – 1/3 cup (65 grams) light brown sugar , lightly packed – 1/2 teaspoon ground cinnamon – tiny pinch of salt – 1/4 cup (60 grams) cold unsalted butter , cubed into small piece FOR THE APPLE MUFFINS: – 2 cups (250 grams) all-purpose flour , spooned & leveled – 2 teaspoons baking powder – 1/2 teaspoon salt – 1 teaspoon ground cinnamon – 1/4 teaspoon ground nutmeg (optional) – 1/2 cup (115 grams) unsalted butter , softened to room temperature – 1/2 cup (100 grams) light brown sugar , lightly packed – 1/2 cup (100 grams) granulated sugar – 2 large eggs , room temperature – 2 teaspoons pure vanilla extract – 1/2 cup (120 grams) sour cream , room temperature (or plain Greek yogurt) – 1/2 cup (120 ml) milk , room temperature – 1 cup (125 grams) chopped apple
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