Step 1

Preheat the oven to 375 degrees F/190C.

Step 2

Grease and flour an 9x13 inch baking pan

Step 3

Sift the flour, salt, baking soda, and baking powder together into a large mixing bowl.

Step 4

In a large mixing bowl. Beat the butter, brown sugar, dark brown sugar, and granulated sugar in until fluffy.

Step 5

Mix in the eggs one at a time, then add the vanilla, cinnamon, and nutmeg.

Step 6

Mix in the flour mixture and mix until combined.

Step 7

Stir in the oats by hand, followed by the raisins.

Step 8

Spread dough evenly into the pan.

Step 9

Spread the dough into the prepared pan and smooth the top. Bake for 30 minutes. After 30 minutes, give the pan a little shake. If it jiggles in the middle, put the pan back in and try again every 5 minutes until there is no longer any jiggle.

Step 10

Remove from the oven and let cool 10 minutes before cutting.

Step 11

Best served warm, but great cooled as well.