Sienna's Bye Bye Brownies

I baked these with my daughter for her last day of pre-school (therefore the name). These brownies are deliciously rich without being too sweet and easy to make - perfect for a day that needs some chocolate goodness..

You Need
Soft Butter for greasing the pan
Flour for dusting the buttered pan
4 large eggs
1 cup sugar
1 cup brown sugar
4 oz melted butter 
2 oz olive oil
1 1/4 cup cocoa sifted
2 teaspoon vanilla extract
1/2 cup flour sifted
1/2 teaspoon kosher salt
1 handful small dark chocolate chips

Directions
Preheat oven to 300 degrees f. 
Butter and flour a 9" pan 
Mix the eggs with a mixer until fluffy and light yellow. 
Add both sugars and mix.
Add remaining ingredients and mix.

Pour the batter into the greased and floured pan and bake for 50 minutes. Check for doneness with a toothpick; a toothpick inserted in the center should come out clean (or almost clean - I personally like them a little bit "wet")
Let brownies cool - once mostly cool cut into squares