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Preheat your oven to 400 degrees.
Combine the crumble topping ingredients in a bowl using a fork, and set it aside.
In a separate bowl, mix the dry ingredients for the muffins, then whisk to ensure they're well combined.
In another large bowl, blend the wet ingredients for the muffins, using softened butter (not hot).
Gradually incorporate the dry muffin ingredients into the wet mixture, adding a bit at a time and blending in between.
Gently fold in the diced apples.
Line your muffin tins and fill them almost to the top with the muffin batter.
Generously sprinkle the crumble topping over the muffins.
Bake for 18-20 minutes.
Serving: 1muffin, Calories: 150kcal, Carbohydrates: 26g, Protein: 3g, Fat: 4g, Saturated Fat: 2g, Polyunsaturated Fat: 0.3g, Monounsaturated Fat: 1g, Trans Fat: 0.1g, Cholesterol: 24mg, Sodium: 181mg, Potassium: 56mg, Fiber: 1g, Sugar: 13g, Vitamin A: 147IU, Vitamin C: 1mg, Calcium: 40mg, Iron: 1mg