Greek Yogurt Espresso Muffins

For The Muffins:

• 
  2 cups all-purpose flour (organic; gluten free and oat will also work)
• 
  2 tsp baking powder
• 
  ¹⁄₂ tsp salt
• 
  ¹⁄₂ tsp cinnamon
• 
  1 tsp espresso powder (1 heaping teaspoon, or a little more if you want a stronger coffee flavor)
• 
  ¹⁄₂ cup monk fruit
• 
  4 tbsp butter (grass-fed)
• 
  ¹⁄₄ cup almond milk (unsweetened)
• 
  ³⁄₄ cup Greek yogurt (organic, plain nonfat)
• 
  1 tsp vanilla extract
• 
  140 g dark chocolate (organic dark chocolate chips or chopped chocolate. I like the brand Hu (1/2 heaping cup apx))

For the Streusel Topping:

• 
  2 tbsp butter (grass fed)
• 
  4 tbsp all-purpose flour (organic)
• 
  2 tbsp monk fruit
• 
  2 tbsp brown monk fruit
• 
  ¹⁄₄ tsp salt
• 
  2 tsp espresso powder
• 
  ¹⁄₂ tsp cinnamon