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1
Heat oil in heavy large deep saute pan over medium heat.
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2
Add yellow onion, bell peppers and garlic. Saute until tender, about 10 minutes.
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3
Add ground beef. Sprinkle with salt. Saute until meat is no longer pink, breaking up meat with back of spoon, about 10 minutes.
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4
Add chili powder, cumin, oregano and black pepper; saute 3 minutes.
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5
Add broth, tomatoes, beer, chipotle chiles and adobo sauce. Simmer uncovered until liquid reduces slightly, stirring occasionally, about 40 minutes.
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6
Add corn and simmer until mixture thickens slightly, about 10 minutes.
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7
Remove from heat. Cool to room temperature.
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8
Cover chili and refrigerate at least 1 day.
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9
DO-AHEAD TIP: Chili can be made up to 2 days ahead. Keep refrigerated.
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10
Position rack in upper third of oven and preheat to 375 degrees F.
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11
Combine both cheeses.
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12
Spread 2 tablespoons beans over one side of 6 tortillas.
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13
Arrange tortillas bean side up and overlapping slightly in 14-by-11-by-3-inch baking dish.
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14
Spoon 1/3 of chili evenly over tortillas.
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15
Sprinkle 2 cups cheese mixture, then 1/4 cup onion over.
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16
Repeat layering 2 times.
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17
Spread remaining 6 tortillas with remaining beans, then arrange tortillas bean side down in casserole.
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18
Sprinkle with remaining cheese mixture.
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19
Bake until casserole is heated through and bubbling, about 50 minutes.
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20
Let stand on cooling rack for 5 minutes.
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21
Cut casserole into generous squares.
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22
Sprinkle with shredded lettuce and top with dollop of sour cream, and serve.