added corn and black beans

base_layers/corn_blackbean.md

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+Corn and Black Beans
+===================
+
+This is a fork of the [Zuccini and Corn Filling](/base_layers/zucchini_corn.md) because I'm not a Zuccini fan. I also tweaked the spices. 
+
+You'll need:
+
+* Fresh corn kernels, cut off the cob. 
+* 1 can of Black Beans
+* half a white onion
+* salt
+* chili powder
+* cumin
+
+Directions
+----------
+
+1. Toast corn in a skillet over high heat with oil and salt for about 5 minutes, or until browned. Remove corn.
+2. Cook onion in the skillet until it caramelizes (about 5 minutes). Leave onion in there.
+3. Add corn back in.
+4. Add black beans.
+5. Toss in a pinch of salt, a healthy couple shakes of chili powder, and a small pinch of cumin.
+6. Cook together for another 5 minute or so.
+
+Delicious hot as the main base_layer or as a supplement to others.
+