Preheat your oven to 375°F (190°C) and prepare a muffin pan with liners or grease lightly.

In a bowl, whisk together flour, baking powder, salt, nutmeg, and cinnamon until light and airy.

In another bowl, combine eggs, sugar, yogurt, oil, and vanilla extract until creamy.

Fold the wet ingredients into the dry mixture until just combined.

Scoop muffin batter into prepared cups, filling each three-quarters full. Add diced apple pie filling on top.

Prepare streusel by mixing flour, brown sugar, and cinnamon with melted butter until crumbs form.

Sprinkle streusel over muffins and bake for 20-25 minutes or until golden brown.

Cool muffins in the pan for 5 minutes, then transfer to a wire rack. Optionally glaze with powdered sugar and milk mixture.