Preheat oven to 350 F, and grease a muffin tin (or use a silicone muffin pan.)
In a large bowl, mix flour, baking powder and cinnamon.
Fold in finely diced strawberries and stir to coat.
In a separate bowl, whisk together eggs, yogurt, buttermilk, coconut oil, vanilla, and maple syrup.
Pour wet ingredients into dry ingredients and stir until well-combined. Do not over-mix.
Portion batter into muffin pan, filling about 3/4 full. (You should get 18 muffins)
In a small bowl, mix together the oats, flour, brown sugar and cinnamon. Pour in melted coconut oil and mix until combined with a fork. Sprinkle evenly on top of each muffin.
Bake 30-35 minutes, or until muffins are completely set and golden brown. These are best eaten same day or next day.