Preheat oven to 400 F.
Make the streusel topping in a small bowl combining the butter, sugar and flour. I like to use a fork to mix until it's crumbly. Set aside.
Slice your strawberries to desire size and toss strawberries with 1 Tbsp. of flour in a small bowl. Set aside.
In a medium size bowl whisk together the eggs, milk, oil and vanilla.
In a large bowl whisk the flour, sugar and baking powder and slowly pour the egg mixture in.
Mix batter just until combined. Do not over-mix. Gently mix in sliced strawberries.
Line your muffin tin and fill liners 2/3 full. Add the streusel topping on top of each muffin.
Bake for 18-20 minutes or until muffins are golden brown and spring back in the center when pressed. When fully baked, remove muffins from tin and cool on a cooling rack and enjoy!