In 12-inch nonstick skillet, cook bacon until crisp; drain on paper towel. On 2 of the bread slices, place 1 slice provolone cheese, 3 slices bacon and 1 slice Cheddar cheese on each. Top with remaining bread slices. Heat griddle or skillet over medium-high heat or to 375°F. In shallow bowl, beat egg, beer, flour and chili powder with fork until smooth. Dip each sandwich into batter, giving it a few seconds on each side to absorb the batter; drain excess batter back into bowl. Melt butter on hot griddle. Place sandwiches on griddle. Cook 3 to 4 minutes on each side until golden brown.
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