My favorite chewy brownie is Fine Cooking's Chewy Brownies:
(This is also listed in the T&T folder).
CHEWY BROWNIES
(I like these both at room temperature and chilled. (They're fudgier when chilled). The leftovers are at their absolute best when individually frozen directly after cooling (if not chilling them). It maintains their crusty top and yields a deeper chocolate taste.
I think the baking time listed is too long for metal pans - I did mine about 32 minutes *(See notes below about pans).
"Added flour helps to give these brownies their chewiness. It's important not to overbake these or they'll dry out."
CHEWY BROWNIES
INGREDIENTS:
4 oz. (8 Tbs.) unsalted butter; more for the pan
4 oz. unsweetened chocolate, chopped
1-1/2 cups sugar (The past few times, I decreased it by about 2 Tbsp for an even more bittersweet taste)
Scant 1/4 tsp. salt
2 tsp. vanilla extract
2 large eggs, at room temperature
4-1/2 oz. (1 cup) flour
2 Tbs. natural cocoa (not Dutch-processed)
DIRECTIONS:
Position an oven rack on the middle rung. Heat the oven to 350°F. Butter an 8-inch square pan, line the pan bottom with parchment (or waxed paper), and then butter the parchment.
In a double boiler over simmering water, melt the butter and chocolate. Remove the pan from the heat; cool slightly. Stir in the sugar, salt, and vanilla. Mix in the eggs, one at a time, stirring each time until blended. Add the flour and cocoa; beat until incorporated and the mixture is smooth, 30 to 60 seconds. Scrape the batter into the prepared pan and bake until the top is uniformly colored with no indentation and a toothpick inserted in the middle comes out almost clean, with a few moist crumbs clinging to it, 35 to 45 min. (I baked about 31 - 32 minutes in a shiny metal pan).
Set the pan on a rack until cool enough to handle. Run a paring knife around the inside edge of the pan and then invert the pan onto a flat surface and peel off the parchment. Flip the baked brownie back onto the rack to cool completely. Cut into squares with a sharp knife. (I let the brownies cool in the pan, then cut them into squares on the parchment).
*Notes:
The recipe gives a range of baking times -- use the shorter time for metal pans, the longer for Pyrex pans.
This recipe can be doubled easily; use a 13X9-inch pan and increase the baking time slightly.
Yields sixteen 2-inch squares. (I cut them into 12 squares).
From "Baking Brownies Just Right: Cakey, Chewy, or Fudgy"
Recipe by Cindy Mitchell - Fine Cooking Magazine
http://www.taunton.com/finecooking/recipes/chewy_brownies.aspx