Preheat George Foreman Evolve Grill to 375°F with baking dish and muffin pan insert in place.
In medium bowl, whisk flour, baking soda and salt until well combined. Set aside.
In large bowl, whisk together pumpkin, sugar and brown sugar. Beat in eggs, vegetable oil and vanilla extract. Whisk in flour mixture, until smooth.
Fill muffin pan insert with paper muffin cups, and fill the cups until they are ¾ full.
In medium bowl, beat cream cheese until smooth. Add in sugar, egg yolk and vanilla extract and beat until combined.
Top each muffin with spoonful of cream cheese mixture.
Bake muffins for 10-14 minutes, or until toothpick inserted in center comes out clean.
